Biology: Quiz 1: Gregor Mendel's Experiments
Probabilities are expressed as a number between...and...
0, 1
Using the group of cards just described in this section, the probability of drawing a red five is:
1/56
Red (heterozygous) x white (homozygous)
2 red, 2 white
If you have two coins, the probability of both coming up heads from a flip of each is...
25%
Red x red (both heterozygous)
3 red, 1 white
The probability of having the combination of one head and one tail when flipping two coins is...
50%
If you have a heterozygous yellow-seed plant (Yy), the probability of forming a "Y" gamete is... The probability of forming a "y" gamete is... This follows the principle of segregation.
50%, 50%
How many combinations of genotypes are possible for the coat coloration of rabbits which is governed by three alleles?
6
The phenotypic ratio for the F2 generation in a dihybrid cross will theoretically be _____.
9:3:3:1
DNA
A giant molecule consisting of the sugar deoxyribose, phosphates and nitrogen bases
The seeds collected from the first generation monohybrids are called:
F1 or hybrid
All the gene pairs from one parent can congregate in one gamete and those from the other parent in other gamete.
False
Each P 1 parent of a monohybrid cross has completely identical genes.
False
Gregor Mendel was a respected, professional scientist who introduced the science of biology.
False
Heterozygous genes will always display a dominant trait
False
The heredity principles developed by Mendel apply only to plants.
False
dominant
In a pair of genes, one may prevent the allele from being expressed
Principle of Seregation
Members of a gene pair separate during meiosis and are found in separate gametes
Which of these paired genes is homozygous?
PP and pp
If the allele are designated (R & r) respectively, what is the probable genotypes of the round seeds which were produced?
RR and Rr
Which symbols (genotypes) are involved in the cross to produce the F 2 generation of roan cattle?
Rr x Rr
The female genotype of the previous problem is:
TT, homozygous
incomplete dominance
The blending of two traits in a heterozygous individual
Which of these genotypes are heterozygous?
Tt
multiple alleles
Where more than two alternatives for a gene exist
The genotype represents:
a paired combination of genes
agouti x agouti
all agouti
agouti x albino
all agouti
agouti x chinchilla
all agouti
albino x albino
all albino
chinchilla x albino
all chinchilla
If the allele are designated (R & r) respectively, what is the probable Phenotype of the parents?
all round
Red flowered snapdragons are crossed with white flowered, producing all pink snapdragons in the F 1 . What would you expect if you crossed white with white?
all white
The results from the original crossing and the secondary crossing, can be explained by realizing that there are three alternative...for hair color. Agouti is dominant over chinchilla, which is dominant over albino.
alleles
allele
alternative forms for a specific gene
homozygous
both genes tall or both genes short
A cross between plants which differ in only two traits is a...cross.
dihybrid
The characteristic which resulted from a monohybrid cross is the...trait.
dominant
A cross involving true-breeding, red snapdragons and true-breeding, white snapdragons produce all pink offspring because both genes are present, neither being...over the other resulting in the...of the trait.
dominant, blending
A test cross is a cross between the unknown...genotype and a homozygous...
dominant, recessive
A...trait completely hides or masks the presence of its counterpart, the...trait.
dominant, recessive
The controlling influence which produced distinct ratios of traits was called...by Mendel and are known today as...
factors, genes
In a dihybrid cross, the F2 will have nine genotypes, but only four phenotypes because the...genes cause the... traits to mask the...traits.
heterozygous, dominant, recessive
To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a... recessive.
homozygous
According to scripture, all known occurrences in the laboratory of the Earth have shown that each kind of organism is limited to reproducing a similar...
kind
What can be expected for the recessive trait of monohybrids from the F 2 generation?
none of the above
heterozygous
one gene tall and the other short
The outward appearance of a particular trait is called the...
phenotype
The difference between appearance and genetic makeup has led to the development of two terms to distinguish the two conditions. The appearance of the organism for the trait is called...; the actual genetic makeup is called...
phenotype, genotype
Genetics experiments on the breeding of plants or animals are based on the laws of
probability
The probability of two independent events occurring together is the...of the probability of each event occurring separately.
product
The calculation of probabilities is based on...events.
random
In addition to covering each pea plant to prevent pollination from other pea plants in his garden, what did Mendel do to prevent self-pollination?
remove the stamen
The reduction of a gene pair to an allele during the formation of a gamete is called the principle of...
segregation
Mendel's first principle, the principle of..., states that in the process of forming gametes, the inheritance factors for any trait always...
segregation, segregate
allele
tall vs short
probability
the chance that a given event will occur
deviation
variation from the predicted values
A monohybrid cross is made between plants:
which differ in only one trait
(purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Which alleles are recessive?
white and wrinkled
With the previous cross, Rr x rr, the offspring will be
1/2 Rr, 1/2 rr
Red flowered snapdragons are crossed with white flowered, producing all pink snapdragons in the F 1 . What would you expect if you crossed pink with pink?... red,...pink,...white.
1/4, 1/2, 1/4
chromosome
A "threadlike" structure in the nucleus, composed of DNA
chinchilla x chinchilla
all chinchilla
Red flowered snapdragons are crossed with white flowered, producing all pink snapdragons in the F 1 . What would you expect if you crossed red with red?
all read
Red (heterozygous) x red (homozygous)
all red
Red x red (both homozygous)
all red
The major probability principle demonstrated in this exercise is that when two events occur at the same time, the probability of each occurrence yielding the same result is the...of the probability of each separate event.
product
As you continue to cross the offspring resulting from the previous question with albinos, what will occur in the growing population?
the percentage of albinos will increase
Why did Mendel prevent his plants from self-pollinating?
to control the crossing of the traits
Red flowered snapdragons are crossed with white flowered, producing all pink snapdragons in the F 1 . What would you expect if you crossed pink with white?
1/2 pink, 1/2 white
Red flowered snapdragons are crossed with white flowered, producing all pink snapdragons in the F 1 . What would you expect if you crossed red with pink?
1/2 red, 1/2 pink
Indicate the phenotypic ratio of crossing the offspring of the agouti from the previous question with an albino.
1/2 agouti,1/2 chinchilla
Indicate the phenotypic ratio of crossing the offspring of the chinchilla from the previous question with an albino.
1/2 chinchilla, 1/2 albino
The second generation phenotypes resulting from the cross of true-breeding monohybrid pollination will display a ratio of:
3:1
Choose the answer that shows the cross between roan and white cattle.
Rr x rr
Each trait characteristic of a plant is determined by:
a pair of genes
(purple smooth = 75, white smooth = 28, purple wrinkled = 24, white wrinkled = 8) Which alleles are dominant?
purple and smooth
When flipping a coin, the chance that it will come up a head is... If you flip the coin a second time, the chance that it will come up a head again is... Let us say that you have had 25 heads come up in 25 consecutive flips. If you flip the coin one more time, the chance of coming up with a head is...
50%, 50%, 50%
