Question 33 In Siamese cats, brown coat color is dominant to beige. Suppose that a brown cat is mated with a beige one and the offspring are 3 brown...

Question 33

In Siamese cats, brown coat color is dominant to beige. Suppose that a brown cat is mated with a beige one and the offspring are 3 brown kittens. What can you conclude about the genotype of the brown parent?

a) The genotype must be Bb.

b) The genotype must be bb.

c)  The genotype must be BB.

 d) The genotype could be either BB or Bb.

Question 34

In animals, the inability to make lactase results in lactose intolerance, a recessive condition. Two lactose tolerant parents, who have decided to have three children, have a first child that is lactose-intolerant (genotype ll). What is the probability that they have three lactose intolerant children?

a) 1/16

b) 1/64

c) 3/4

d) 3/16

 e) 1/2

Question 35

Honeybees have a haplo-diploid sex determination system where females develop from a fertilized egg (they are diploid, having one allele from the female queen and one allele from the male), and males develop from unfertilized eggs (they are haploid, having only one allele from the queen). Assuming that the queen is heterozygous for a particular gene, what is the probability that a female will inherit the recessive allele from her mother? What is the probability that a male will inherit a recessive allele from his mother?

a) The probability that a daughter will inherit a recessive allele from her mother is 0%; the probability that a son will inherit a recessive allele from his mother is 100%.

b) The probability that a daughter will inherit a recessive allele from her mother is 50%; the probability that a son will inherit a recessive allele from his mother is 50%.

c) The probability that a daughter will inherit a recessive allele from her mother is 100%; the probability that a son will inherit a recessive allele from his mother is 100%.

d) The probability that a daughter will inherit a recessive allele from her mother is 50%; the probability that a son will inherit a recessive allele from his mother is 100%.

e) The probability that a daughter will inherit a recessive allele from her mother is 100%; the probability that a son will inherit a recessive allele from his mother is 50%.

Question 36

A couple has six daughters and is expecting a seventh child. What is the probability that this child will be a boy?

a) 1/16

b) 1/2

c) 1/4

d) 1/128

 e) 1/64

Question 37

In Mendel’s peas, yellow seeds are dominant to green. A pure-breeding yellow plant is crossed with a pure-breeding green plant. All of the offspring are yellow. If one of these yellow offspring is crossed with a green plant, what will be the expected proportion of plants with green seeds in the next generation?

a) 25%

b) 100%

c) 0%

d) 50%

e) 75%

Question 42

If a woman and a man already have three boys, what is the probability that the next child will be a boy?

a) 1/2

b) 1/16

c)

d)  1/4

 e) 1/8

Question 44

A female with androgen-insensitivity syndrome, a sex-linked recessive condition, has

a) a pair of ovaries that overproduce estrogen.

b) a pair of internal testes that produce testosterone.

c) an inactive SRY gene.

d) a XXX chromosome constitution that causes her not to produce testosterone.

 e) two X chromosomes, both carrying mutant alleles in the gene that makes the androgen receptor.

Question 47

A human baby with two X chromosomes...

a) is heterozygous for all X-linked genes

b) is male

c) does not have the SRY gene

d) is homozygous for all X-linked genes

Question 51

Sequence comparisons have suggested that during evolution some genes have "jumped" from mitochondria to…

a) the cell membrane.

b) to bacteria.

c) none – DNA does not move between organelles.

 d) the cytoplasm.

e) both nuclei and chloroplasts.

Question 52

Eukaryotic DNA condensation occurs in which order?

a) prometaphasic chromosome, 30nm fiber, loops, nucleosome, double helix.

b) double helix, nucleosome, loops, 30nm fiber, prometaphasic chromosome.

c) double helix, 30nm fiber, nucleosome, loops, prometaphasic chromosome.

d) double helix, nucleosome, 30nm fiber, loops, prometaphasic chromosome.

 e) double helix, loops, nucleosome, 30nm fiber, prometaphasic chromosome.