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Chapter 12: Q. 20 (page 327)

Labrador retrievers’ fur color is controlled by two alleles, E and B. Any dog with the ee__ genotype develops into a yellow lab, while B_E_ dogs become black labs and bbE_ dogs become chocolate labs. This is an example of _____.

a. epistasis

b. codominance

c. incomplete dominance

d. linkage

Short Answer

Expert verified

The correct option is A.

Step by step solution

01

Step1. Introduction

In many regions of the world, Labrador Retrievers are still a widely known dog breed. There are three distinguishable colours: black, chocolate, and yellow. Whereas this seems to be a case of epistasis in this question.

02

Step. 2 Explanation for correct option.

The expression of one gene is altered by that of the articulation about one or more individually shared genes, which is known as epistasis.

03

Step. 3 Explanation for incorrect option. 

Option b. Codominance describes the phenomenon wherein two alleles are revealed to the same extent inside an organism.

Option c. Incomplete dominance comes out of a cross wherein every parental contribution is separate and distinct, giving rise to children with an intermediate phenotype.

Option d. The close relationship of genes or any other Genetic material on the very same genome is regarded to as linkage.

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Most popular questions from this chapter

Consider a cross to investigate the pea pod texture trait, involving constricted or inflated pods. Mendel found that the traits behave according to a dominant/recessive pattern in which inflated pods were dominant. If you performed this cross and obtained 650 inflated-pod plants in the F2 generation, approximately how many constricted-pod plants would you expect to have?

a. 600

b. 165

c. 217

d. 468

The gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is dominant to terminal, list all of the possible F1 and F2 genotypes and phenotypes from a cross involving parents that are homozygous for each trait. Express genotypes with conventional genetic abbreviations.

If the allele encoding polydactyly (six fingers) is dominant why do most people have five fingers?

a. Genetic elements suppress the polydactyl gene.

b. Polydactyly is embryonic lethal.

c. The sixth finger is removed at birth.

d. The polydactyl allele is very rare in the human population.

If black and white true-breeding mice are mated and the result is all gray offspring, what inheritance pattern would this be indicative of?

a. dominance

b. codominance

c. multiple alleles

d. incomplete dominance

Which of the following situations does not follow the Law of Independent Assortment?

a. A blind man and a brunette woman produce three offspring over time, all of who have blind hair.

b. A white cow crossed with a brown bull produces roan cattle.

c. Mating a hog with a sow produces six female piglets.

d. Men are more likely to experience hemophilia than women.

See all solutions

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