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Chapter 12: Q. 11 (page 326)

A recessive trait will be observed in individuals that are ________ for that trait.

a. heterozygous

b. homozygous or heterozygous

c. homozygous

d. diploid

Short Answer

Expert verified

The correct answer is option c

Step by step solution

01

Step 1. Introduction

Recessive traits are those traits that are expressed only when genotype is homozygous.

02

Step 2. Explanation of the correct options

Option c is correct because recessive traits will be observed only when the individuals are homozygous for that trait because for the recessive traits to appear, there should be two recessive alleles (homozygous) otherwise dominant alleles in heterozygous will show dominant traits.

03

Step 3. Explanation of the incorrect options

Option a is incorrect because recessive traits will be observed only when the individuals are homozygous for that trait instead of heterozygous.

Option b is incorrect because recessive traits will be observed only when the individuals are homozygous for that trait instead of both heterozygous and homozygous.

Option d is incorrect because recessive traits will be observed only when the individuals are homozygous for that trait instead of diploid.

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Most popular questions from this chapter

Use the probability method to calculate the genotypes and genotypic proportions of a cross between AABBCc and Aabbcc parents

Figure 12.5In pea plants, round peas ( R ) are dominant to wrinkled peas ( r ). You do a test cross between a pea plant with wrinkled peas (genotype rr ) and a plant of unknown genotype that has round peas. You end up with three plants, all of which have round peas. From this data, can you tell if the round pea parent plant is homozygous dominant or heterozygous? If the round pea parent plant is heterozygous, what is the probability that a random sample of 3 progeny peas will all be round?

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

In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant:heterozygous: homozygous recessive) would you expect to observe in the offspring?

a. 1:2:1

b. 3:1:1

c. 1:2:0

d. 0:2:1

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
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