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Chapter 12: Q. 10 (page 326)

The observable traits expressed by an organism are described as its ________. a. phenotype b. genotype c. alleles d. zygote

Short Answer

Expert verified

Option a is correct.

Step by step solution

01

Step 1. Introduction

Specific characteristics of an organism are known as traits. These traits can be determined by the gene, environment, or by both gene and environment.

02

Step 2. Explanation of the correct option

Option a is correct because the phenotype refers to the physical appearance for the specific feature.

03

Step 3. Explanation of the incorrect option

Option b is incorrect because genortype is a gentic constitution of any particular traits.

Option c is incorrect because allels refers to the alternative forms of the gene.

Option d is incorrect because zygote is a fertilized egg result form the fertilization of ova and sperms.

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Most popular questions from this chapter

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

In Section 12.3, 鈥淟aws of Inheritance,鈥� an example of epistasis was given for the summer squash. Cross white WwYy heterozygotes to prove the phenotypic ratio of 12 white:3 yellow:1 green that was given in the text.

Why is it more efficient to perform a test cross with a homozygous recessive donor than a homozygous dominant donor? How could the same information still be found with a homozygous dominant donor?

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 ABO blood groups in humans are expressed as the I A , I B , and i alleles. The I A allele encodes the A blood group antigen, I B encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (I A i) and a heterozygous blood type B parent (I B i) mate, one quarter of their offspring will have AB blood type (I A I B ) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

a. multiple alleles and incomplete dominance

b. codominance and incomplete dominance

c. incomplete dominance only

d. multiple alleles and codominance
See all solutions

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