1.Which of the following statements is true regarding the inheritance of a human

Question

1.Which of the following statements is true regarding the inheritance of a human X-linked recessive trait if the mother is a carrier and the father is unaffected?

A. All sons will be affected. B. None of the offspring will be affected. C. On average, half of the daughters will be carriers and half of the sons will be affected. D. On average, half of the daughters will be affected and half of the sons will be affected. E. All daughters will be affected.

2. On the planet Kermit, in the Muppet population, there are two autosomal loci of interest. The first locus has alleles A and a, and the second locus has alleles B and b.

The following phenotypes are associated with the alleles: Locus 01 A = Yellow hair; a = Orange hair. Locus 02 B = Green skin; b = Blue skin. The A and B alleles are dominant for their respective loci. Suppose a true breeding Yellow-haired, Green-skinned Muppet male mates with a true breeding Orange-haired, Blue-skinned Muppet.

The couple produces multiple offspring, and a pair of the F1 Muppets intercross to produce 500 offspring. The counts for each pair of phenotypes are as follows:

Table 1. Counts of F2 phenotype pairs from F1 Muppet intercross Phenotype pair Count Yellow hair, Green skin 282 Yellow hair, Blue skin 0 Orange hair, Green skin 93 Orange hair, Blue skin 125

The results presented in Table 1 suggest that:

A. Locus 01 and Locus 02 are on different chromosomes.

B. Hair color is independent of and individual's Locus 01 genotype for all Muppets.

C. Locus 01 and Locus 02 act independently in this population.

D. Skin color is independent of an individual's Locus 02 genotype for all Muppets.

E. Locus 01 and Locus 02 act epistatically in this population.

3.For a pair of genes with alleles: A (dominant) a (recessive) at the first locus; and B (dominant) b (recessive) at the second locus, that operate in a duplicate dominant epistatic manner, what proportion of offspring from a doubly-heterozygous mating are expected to show the recessive phenotype?

A. 9/16. B. 1/16. C. 0.5. D. 1 (it's dominant). E. 7/16.

4.Fluffernutter labradors are identical to Earth labradors in every way, except that they grow marshmallows instead of fur. The three possible types of marshmallow skin are: a. Black (tastes like licorice); b. Chocolate (tastes like chocolate); c. Yellow (tastes like vanilla). There are two genes that control for this phenotype, acting in a recessive epistatic manner. The two-locus genotypes that correspond to the phenotypes are: A_B_ (codes for Licorice); aaB_ (codes for Chocolate); __bb (codes for Vanilla). Note that the alleles at the two loci are: A (dominant), a (recessive), (Locus 01) B (dominant), b (recessive). (Locus 02) If two doubly heterozygous Licorice Labs mate, what is the expected proportion of Licorice fluffernutter progeny?

A. 3/16. B. 3/4. C. 1/8. D. 9/16. E. 1/2. 5.If a marker locus with two alleles A and B and respective allele frequencies p and q is in Hardy-Weinberg Equilibrium, the population BB genotype frequency is: A. 1-q2. B. q2. C. p2 + q2. D. q. E. 2pq.

Explanation / Answer

Answers:

Q1). C

Q2). E

Q3). B

Q4). D

Q5). B

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