16
A cross between two individuals heterozygous for two genes is called a
dihybrid cross
Crossing long and round turnips yields oval offspring. Between the alleles for turnip shape is
incomplete dominance
If a single-trait cross yields 3 phenotypes, there must be _____ between the alleles of the trait.
incomplete dominance
Long radishes crossed with round radishes result in all oval radishes. This relationship between the alleles is
incomplete dominance
Genetic traits of seeds are noted as follows: long (L) > short (l), wrinkled (W) > smooth (w), yellow (Y) > white (y), and ribbed (R) > grooved (r). What is the genotype of a short, wrinkled, yellow, grooved seed?
ll Ww YY rr.
Following Mendel's second law a multi-trait cross equals
multiple single-trait crosses
A phenotype or trait that sows continuous variation among the individuals of a population is called
polygenic
The frequency distribution of the distance Red kangaroo can jump is a bell-curve. The distance the Red kangaroo jumps is a _____ trait.
polygenic
The second law of Mendel states that
trait are inherited independently
What cross yields a phenotypic ratio of offspring of3 A-B-, 3 A-bb, 1 aaB- , and 1 aabb.
AaBb x Aabb
What cross yields a phenotypic ratio of offspring of 3 A-B-, 1 A-bb, 3 aaB- , and 1 aabb.
AaBb x aaBb
What cross yields a phenotypic ratio of offspring of 1 A-B-, 1 A-bb, 1 aaB- , and 1 aabb.
AaBb x aabb
In humans, the ABO blood groups are controlled by one trait with 3 alleles: the alleles for A and B type blood are co-dominant toward each other and both are completely dominant to the allele for O type blood.What is the genotype of the parents if one parent has AB type blood and the other parent has B type blood but of the children 1/4 have type A, 1/4 have type AB, and 1/2 have type B blood?
IAIB and IBIo
In peas Yellow (Y) is dominant over green (y), Round seeds (R) over wrinkled seeds (r), Bitter (B) over sweet (b), and Smooth (S) over hairy (s). In length seed pods can be long (LL), medium (L) or short (ll).Given a cross between (male) Yy Rr Bb SS Ll x yy RR Bb Ss Ll (female), what percentage of the offspring will be hairy, medium, and sweet?
0 %
What is the probability that a calf of a roan bull and cow will be red?
0.25
The shape of radishes may be long, round, or oval. A cross between long and round radishes produces oval offspring. The phenotypic ratio of the offspring of a cross between two oval-shaped parents is
1 round: 2 oval: 1 long
A cross between long and round turnips yields all oval turnips. How many traits are involved?
1 trait, 2 alleles
What is the probability of obtaining an offspring that is recessive of each trait of a test cross involving four traits (each with complete dominance)?
1/16
Assume that D, E, F, G, H, and I are the dominant alleles and the small letters are the recessive alleles if these traits.from the mating of the parents DdeeFfGGHhIi x DdEEFFGgHhii, what is the probability that an offspring will be heterozygous for each trait?
1/32
In peas, seeds can be round (R) or wrinkled (r) and either yellow (Y) or green (y). Stems may be tall (T) or short (t).In the cross between TtYYRr x ttYYrr, what proportion of offspring will be tall with yellow, round seeds?
1/4
An organism has the genotype AaBb. According to Mendel's laws of inheritance which of the following gametes will the organism produce?
1/4 with a and b together, 1/4 with a and B together, 1/4 with A and b together, and 1/4 with A and B together.
Assume that D, E, F, G, H, and I are the dominant alleles and the small letters are the recessive alleles if these traits.from the mating of the parents DdeeFfGGHhIi x DdEEFFGgHhii, what is the probability that an offspring will have genotype DdEeFFGghhIi?
1/64
The probability that an individual with the genotype MnNnPp will produce a gamete containing simultaneously M, N, and P is.
1/8
In peas Yellow (Y) is dominant over green (y), Round seeds (R) over wrinkled seeds (r), Bitter (B) over sweet (b), and Smooth (S) over hairy (s). In length seed pods can be long (LL), medium (L) or short (ll).Given a cross between (male) Yy Rr Bb SS Ll x yy RR Bb Ss Ll (female), how many different phenotypes are possible in the F1 offspring?
12
Leg feathering in chickens is a polygenic trait in which for each gene one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. A test cross produces 3 chicks with and 1 chick without leg feathers. What is the ratio of feathered to non-feathered chicks in the corresponding hybrid cross?
15 : 1
Leg feathering in chickens is a polygenic trait in which for each of two genes one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. Based on the abundance of feathers on their legs, there are 5 leg-feather classes. What is the ratio of feathered and non-feathered offspring of the hybrid cross?
15: 1
How many different phenotypes are there among the offspring of a tets cross involving 4 traits (each with complete dominance)?
16 (24)
Assume that D, E, F, G, H, and I are the dominant alleles and the small letters are the recessive alleles if these traits.from the mating of the parents DdeeFfGGHhIi x DdEEFFGgHhii, how many different gametes arfe produced by each parent?
16; 8., 32; 16
In peas Yellow (Y) is dominant over green (y), Round seeds (R) over wrinkled seeds (r), Bitter (B) over sweet (b), and Smooth (S) over hairy (s). In length seed pods can be long (LL), medium (L) or short (ll).Given a cross between (male) Yy Rr Bb SS Ll x yy RR Bb Ss Ll (female), what percentage of the offspring will be round, bitter, and long?
18.75 % (3/16)
What is the phenotypic ratio of the offspring of a test cross if the phenotypic ratio of offspring of the corresponding hybrid cross is 9: 3: 3: 1?
1: 1: 1: 1
A chestnut (i.e., brown or red) stallion and a white mare have a roan foal. How many coat color phenotypes are there in the cross?
2
Leg feathering in chickens is a polygenic trait in which for each gene one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. Based on the abundance of feathers on their legs, there are 5 leg-feather classes. How many genes determine leg feathers in the chicken?
2
Leg feathering in chickens is a polygenic trait in which for each gene one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. Based on the abundance of feathers on their legs, there are 5 leg-feather classes. There are ____ classes in which the chickens have leg feathers and there is ____ classes in which chickens do not have leg feathers.
2; 3., 4, 1
In peas, seeds can be round (R) or wrinkled (r) and either yellow (Y) or green (y). Stems may be tall (T) or short (t).In the cross between TTyyRr x TtYyRr, how many different types of gametes can be produced by each parent?
2; 8
In peas, seeds can be round (R) or wrinkled (r) and either yellow (Y) or green (y). Stems may be tall (T) or short (t).In the cross between TTYyRr x TtYyRr, what proportion of offspring will be tall with yellow, wrinkled seeds.
3/16
What is the probability that an offspring of a trihybrid cross will have the phenotype aaB-cc?
3/64
A pure-bred Red pig is crossed with a pure-bred White pig. The F1 progeny are all Red. However, when the F1 individuals are interbred, the F2 generation shows 9/16 Red and 1?16 White offspring and 6?16 pigs with a novel color, Sandy. What is the genotype of the parents?
AaBb x AaBb
In peas Yellow (Y) is dominant over green (y), Round seeds (R) over wrinkled seeds (r), Bitter (B) over sweet (b), and Smooth (S) over hairy (s). In length seed pods can be long (LL), medium (L) or short (ll).Given a cross between (male) Yy Rr Bb SS Ll x yy RR Bb Ss Ll (female), what percentage of the offspring will be green, bitter, and smooth?
37.5 % (1/2 x 3/4)
Leg feathering in chickens is a polygenic trait in which for each gene one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. A cross of two chickens with leg feathers produces 15 chicks with and 1 chick without leg feathers. What is the ratio of feathered to non-feathered chicks in the corresponding test cross?
3: 1
Leg feathering in chickens is a polygenic trait in which for each gene one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. A hybrid cross produces 15 chicks with and 1 chick without leg feathers. What is the ratio of feathered to non-feathered chicks in the corresponding test cross?
3: 1., 15 : 1
Leg feathering in chickens is a polygenic trait in which for each of two genes one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. Based on the abundance of feathers on their legs, there are 5 leg-feather classes. What is the ratio of feathered and non-feathered offspring of the test cross?
3: 1., 15: 1
If long radishes crossed with round radishes results in all oval offspring. What is the proportion of oval radishes in the F2 generation?
50 %
The distance a red kangaroo can jump is determined by 3 genes each of which have an allele that contributes to the distance jumped (Capital letter) and an allele that does not (small letter). How many distanc classes are ther among the red kangaroos?
7
In peas Yellow (Y) is dominant over green (y), Round seeds (R) over wrinkled seeds (r), Bitter (B) over sweet (b), and Smooth (S) over hairy (s). In length seed pods can be long (LL), medium (L) or short (ll).Given a cross between (male) Yy Rr Bb SS Ll x yy RR Bb Ss Ll (female), how many different genotypes are possible in the F1 offspring?
72
In peas Yellow (Y) is dominant over green (y), Round seeds (R) over wrinkled seeds (r), Bitter (B) over sweet (b), and Smooth (S) over hairy (s). In length seed pods can be long (LL), medium (L) or short (ll).Given a cross between (male) Yy Rr Bb SS Ll x yy RR Bb Ss Ll (female), how many different gametes can be formed by the female plant?
8
In peas, seeds can be round (R) or wrinkled (r) and either yellow (Y) or green (y). Stems may be tall (T) or short (t).In the cross between TTyyRr x TtYyRr, how many different phenotypes are there among the offspring?
8 (23)
Radishes have incomplete dominance on shape and color. Thus, radishes occur in ____ different phenotypes.
9
A cross between a long, red-flowered turnip and a round, white-flowered plant yields offspring that are all oval and pink-flowered. How many different phenotypes are there in the F2 generation?
9 (3 x 3)
What is the phenotypic ratio of the offspring of a hybrid cross if the phenotypic ratio of the offspring of the corresponding test cross is 1: 1: 1: 1?
9: 3: 3: 1
In humans, the ABO blood groups are controlled by one trait with 3 alleles: the alleles for A and B type blood are co-dominant toward each other and both are completely dominant to the allele for O type blood.If a person with type AB blood marries someone with type O blood, what are the phenotypes of their children?
A type and B type
A pure-bred Red pig is crossed with a pure-bred White pig. The F1 progeny are all Red. However, when the F1 individuals are interbred, the F2 generation shows 9/16 Red and 1?16 White offspring and 6?16 pigs with a novel color, Sandy. What is(are) the phenotype(s) of the Sandy annimals?
A-bb or aaB-
Radishes can be long (AA), oval (Aa), or round (aa). What cross yields (a)all long offspring, (b) all oval offspring, and (c) all round offspring?
AA x AA; AA x aa; aa x aa.
What cross yields a phenotypic ratio of offspring of1 A-B-, 1 A-bb, 0 aaB- , and 0 aabb.
AaBb x AABb
What cross yields a phenotypic ratio of offspring of9 A-B-, 3 A-bb, 3 aaB- , and 1 aabb.
AaBb x AaBb
Hair length and hair color of cats are inherited following Mendel's laws. Short hair (L) is dominant over long hair (l) and Black (B) is dominant over blue (b) color. What is the phenotype of the parents that produce 9 black short-haired, 3 blue short-haired, 3 black long-haired, and 1 blue long-haired kittens?
Black short-haired x black short-haired
In humans, the ABO blood groups are controlled by one trait with 3 alleles: the alleles for A and B type blood are co-dominant toward each other and both are completely dominant to the allele for O type blood.Determine the likely father when father #1 is type A and father #2 is type AB but the mother is type B and the child has type O blood?
Father #1 (IAIo)
In humans, the ABO blood groups are controlled by one trait with 3 alleles: the alleles for A and B type blood are co-dominant toward each other and both are completely dominant to the allele for O type blood.Determine the likely father when father #1 is type A and father #2 is type B but the mother is type B and the child has type AB blood?
Father #1 (IAIo) or (IAIA)
In humans, the ABO blood groups are controlled by one trait with 3 alleles: the alleles for A and B type blood are co-dominant toward each other and both are completely dominant to the allele for O type blood.What is the genotype of the parents if one parent has A type blood and the other parent has B type blood and all four blood types are represented among their children?
IAIo and IBIo
What is the genotype of the parents if their four children each have a different blood type?
IAIo and IBIo
If both parents are homozygous for the ABO blood group alleles but one has blood type A and the other has blood type B. What is the blood type of the children?
Type AB.
What blood type is not possible for children of a mother with blood type AB and a father with blood type B?
Type O
Flower color and plant size are assorted independently in violets. Let W be purple flowers and w be white flowers, and D be tall and d be dwarf plants. What combination of gametes is produced by an individual heterozygous for both traits?
WD, Wd, wD, and wd
Co-dominance reflect the relationship between alleles of
a single trait
Leg feathering in chickens is a polygenic trait in which for each gene one allele (capital letter) contributes to leg feathering and one allele (small letter) does not. Based on the abundance of feathers on their legs, there are 5 leg-feather classes. What is the genotype of the chickens that have no leg feathers?
aabb, the genotype without capital letters
In horses and animal can be red(RR), Roan (Rr), or white (rr). What are the phenotypic ratio of the offspring of the following crosses?(a) Red stallion x white mare.(b) Red stallion x roan mare.(c) Roan stallion x roan mare.
all roan; 1/2 red and 1/2 roan; 1/4 red 1/4 white and 1/2 roan
A chestnut (i.e., brown or red) stallion and a white mare have a roan foal. Between the coat color alleles of the horse there is
co-dominance
