BIO102 Chapter 10 Quiz

A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila. What proportion of the female offspring will have white eyes? 0% 25% 50% 75% 100%

0%

In a monohybrid cross, how many traits are examined? 1 2 3 4 5

1

If a heterozygous dominant tall pea plant is crossed with a short pea plant, what is the expected phenotypic ratio of tall:short plants? 1:1 1:2 3:1 all tall all short

1:1

How many different gametes can be produced from the genotype AaBBDDEeff? 1 2 4 8 16

4

Morgan breeds and sells snakes. He knows that he can make the most money by breeding and selling albino snakes. Albinism is a recessive trait. His female albino corn snake just produced 6 offspring. Two displayed normal coloration and 4 were albino. What is the chance that another offspring produced by the same parents will be albino? 0% 25% 50% 75% 100%

50%

Vitamin-D resistant rickets is a sex-linked dominant trait which leads to softening of the bones which can cause fractures and deformities. Rickets is often due to a deficiency of vitamin D, however, with vitamin-D resistant rickets, ingestion of vitamin D is ineffective. Maria's mother is normal and does not display any symptoms of this disease; however, Maria's father has the disease. Maria marries a man that does not have the disease. What is the probability that they will have a daughter that has the disease? 0% 25% 50% 75% 100%

50%

In a dihybrid cross where both parents are heterozygous, the phenotypic ratio is ________. 1:2:1 9:3:3:1 1:1:1 3:1 1:1:1:1

9:3:3:1

A cow with black and white patches is produced from a white bull and a black cow. This is an example of incomplete dominance. Codominance. dominance/recessive trait. Polygenic. Pleiotropy.

Codominance.

If the parental genotype if EeWw what are the potential allele combinations that could occur at the end of Meiosis? EW, Ew, eW, and ew EW, EE, eW, and ww WW, Ew, EW, and ew EE, WW, ee, and ww EW, Ew, ee and ww

EW, Ew, eW, and ew

Parents with the dominant phenotype cannot have offspring with the recessive phenotype. True because the dominant gene must be passed down from each parent. True because at least one dominant gene will be passed down from each parent. False because one parent could carry the recessive allele. False because both parents could carry the recessive allele. True because both parents have the dominant allele.

False because both parents could carry the recessive allele.

Morgan buys a male python from a snake dealer who tells him that the snake carries the albino allele. Morgan mates the snake with an albino female and 4 normally pigmented offspring are produced. Morgan rushes back to the snake dealer and demands his money back stating that the male he bought is not heterozygous for the albino allele because all of its offspring had normal pigmentation. True because according to the laws of probability, at least one of the offspring should have been an albino. True because 50% of all offspring produced must be albino. False because for each offspring there is a 50% chance that it will have normal pigmentation. False because a heterozygous male will only pass the dominant allele to its offspring. True because if at least one parent is homozygous recessive, at least one of their offspring must also show the recessive trait.

False because for each offspring there is a 50% chance that it will have normal pigmentation.

Which of the following is TRUE? Females can be heterozygous for sex-linked traits. All traits on the sex chromosomes are associated with sexual development. Males are heterozygous for the SRY gene. The X and Y chromosomes are homologous. Men pass their X-linked traits to their sons.

Females can be heterozygous for sex-linked traits.

What are all possible gametes that can be produced by an individual with the following genotype, FFGg? Fg, FG FF Fg FG, Fg, fG, fg Fg, fG

Fg, FG

Morgan breeds and sells snakes. He knows that he can make the most money by breeding and selling albino snakes. Albinism is a recessive trait. His female albino corn snake just produced 6 offspring. Two displayed normal coloration and 4 were albino. What do you know about the genotype of the father? He must be homozygous dominant. He must be heterozygous. He must be homozygous recessive. He could be either heterozygous or homozygous dominant. There is not enough information to determine the father's genotype.

He must be homozygous recessive.

Red-green colorblindness is a recessive X-linked trait. If a female is red-green colorblind, which of the following is TRUE? Her mother must be colorblind. Both her parents must be colorblind. Both her parents are carriers of the recessive allele. Her father must be colorblind. Women cannot exhibit red-green colorblindness because they have two X chromosomes.

Her father must be colorblind.

A long-winged Drosophila female with a gray body mates with a black, short-winged male fly. The phenotypic ratio of the offspring is 1:1:1:1. What is the genotype of the female fly? LlGg LLGG llgg LLgg llGG

LlGg

What does true-breeding mean? The organism has 2 parents. The organism can be cross-pollinated. The organism is self-pollinated. The organism is easy to cultivate. The organism cannot be cultivated.

The organism is self-pollinated.

If an individual expresses a dominant disease, which of the following is true? All of his children will always inherit the disease. He will pass this disease to all of his daughters. There is at least a 50% probability that his children will inherit the disease. There is a 100% possibility that his sons will inherit this disease. None of his children will inherit the disease unless his wife also has the disease.

There is at least a 50% probability that his children will inherit the disease.

The garden pea was a good model for Mendel's genetics experiments. Which of the following is NOT true regarding this model organism? The plants were easy to grow. Pea plants can either cross-pollinate or self-pollinate. There was only one variety of pea available to Mendel. The plants had several traits that were easily identified. Most of the traits studied had no intermediate stage.

There was only one variety of pea available to Mendel.

Morgan breeds and sells snakes. He knows that he can make the most money by breeding and selling albino snakes. Albinism is a recessive trait. His female albino corn snake just produced 6 offspring. Two displayed normal coloration and 4 were albino. What do you know about the genotype of the baby snakes with the normal coloration? They must be homozygous dominant. They must be homozygous recessive. They must be heterozygous. They could be either heterozygous or homozygous dominant. There is not enough information to determine their genotype but we know that they must carry the dominant allele.

They must be heterozygous

A man with blood type A and a woman with blood type B can have a baby with blood type O blood. True because A and B are the dominant blood types and both individuals could carry a type O allele. False, the child must have type AB blood. True because A and B are codominant. False because Type A and B are dominant blood types and these individuals cannot have an offspring with the recessive blood type. True because only 1 O allele is needed.

True because A and B are the dominant blood types and both individuals could carry a type O allele.

Martha has a widow's peak and attached earlobes. Martha's dad had a straight hairline and unattached earlobes. What is Martha's genotype? WWEE WwEE wwee WwEe Wwee

Wwee

A male is always homozygous for a trait that is _________. codominant X-linked autosomal dominant dihybrid

X-linked

Vitamin-D resistant rickets is a sex-linked dominant trait which leads to softening of the bones which can cause fractures and deformities. Rickets is often due to a deficiency of vitamin D, however, with vitamin-D resistant rickets, ingestion of vitamin D is ineffective. Maria's mother is normal and does not display any symptoms of this disease; however, Maria's father has the disease. Will Maria have the disease? Yes because this is a dominant disease so only one copy of the bad gene is needed to express the disease. No because 2 copies of the gene are needed for a woman to display symptoms of an X-linked trait. Yes because a daughter always expresses X-linked traits that she inherits from her from her father. No, only male children will exhibit X-linked traits. Yes, because Maria's mother is likely a carrier for the disease.

Yes because this is a dominant disease so only one copy of the bad gene is needed to express the disease.

The filled-in squares of a Punnett square represent the numbers of individuals with each version of a trait. all possible combinations of gametes based on a cross between the two parents. an exact ratio that must always occur when the same parents have 4 offspring. examples of some of the offspring that can arise from a one-trait cross. the gametes from one parent.

all possible combinations of gametes based on a cross between the two parents.

Alleles A, B, and C are found on the same chromosome with alleles a, b, and c on the homologous chromosome. If alleles A and C on one homologous chromosome, and a and c on the other homologous chromosome are typically inherited together, this suggests that A and C alleles are closer together than the a and c alleles. the order of the alleles on one homologous chromosome is A, B, C. alleles a and c are closer together than alleles c and b. a recombinant gamete would contain alleles A, B, and C. crossing over often occurs between sister chromatids.

alleles a and c are closer together than alleles c and b.

Alleles are dominant traits. recessive traits. 2 versions of the same trait. alternate versions of the same trait. exact copies of the same trait.

alternate versions of the same trait.

Which variable will determine the coat color in Himalayan rabbits? the genetics will determine it 100% the environment will determine it 100% both the genetics and environment will determine the coat color neither the environment or genes will play a role in determining coat color

both the genetics and environment will determine the coat color

A heterozygote for a trait exhibiting incomplete dominance will express the dominant trait. express the recessive trait. exhibit an intermediate phenotype. express both alleles. exhibit an intermediate genotype.

exhibit an intermediate phenotype.

Which of the following is an example of a phenotype? AAGg freckles AA Ag Gg

freckles

Which of the following is incorrectly matched? physical expression of a trait - phenotype allele that masks expression of alternate allele - dominant identical alleles - homologous allele whose expression can be masked by an alternate allele - recessive the specific alleles that an individual has - genotype

identical alleles - homologous

The distance between the alleles for one trait and the alleles for a second trait is called the map units gap distance dominant distance gene locus

map units

Sickle cell disease is caused by a single mutation in the DNA of a particular gene. A person with this disease has red blood cells that lose their original donut shape and form a sickle shape. People with this disorder suffer from low energy levels, blood clots, and strokes. This is an example of a multifactorial trait. polygenic inheritance. pleiotropy. codominance. incomplete dominance.

pleiotropy.

Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of ________________. a multifactorial trait polygenic inheritance pleiotropy codominance incomplete dominance

polygenic inheritance

In a one-trait test cross, the phenotype that disappears in the F1 generation is the ______. dominant trait negative trait recessive trait heterozygote homozygote

recessive trait

During meiosis, each pair of alleles on the homologous chromosomes sorts independently from all other pairs of alleles. This statement corresponds to the rule of multiplication. the law of segregation. the law of probability. gene theory. the law of independent assortment.

the law of independent assortment.

The outcome of a genetic cross involving eye color and body type is predicted to have a 25%: 25%: 25%: 25% ratio. When bred the organisms produced offspring with the following ratio 45%: 45%: 3%: 3%. These results are most likely due to: the two genes in question being linked on the same chromosome a spontaneous mutation within the offspring pure chance an innacurate prediction for the 25%: 25%: 25%: 25% ratio the two genes being on separate chromosomes

the two genes in question being linked on the same chromosome

The allele for white eyes is located at loci 12 while the allele for hairy body is located at loci 16 on one chromosome. The allele for red eyes is located at loci 15 while the allele for normal body is located at loci 17 on a second chromosome. Which allele combination has the greater map distance? white eyes and hairy body white eyes and normal body red eyes and normal body red eyes and hairy body white eyes and red eyes

white eyes and hairy body