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Chapter 12: Q. 1 (page 326)

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?

Short Answer

Expert verified

There is a 1/8th probability of random sample of 3 progeny of peas to be round.

Step by step solution

01

Step 1. Given Introduction

According to the question In pea plants, wrinkled peas (r) are recessive to round peas (R). A test cross is done between a wrinkled pea plant with genotype (rr) and an unknown genotype plant that has round peas. This gives three plants with round peas.

A test cross is used to check whether the genotype of the dominant plant is homozygous or heterozygous.

02

Step 2. Explanation

As the data set is too small it is not possible to be sure the plant is homozygous or heterozygous, by random chance, it might possible plant acquired all dominant traits only even if the recessive gene is presented. If the round pea plant is heterozygous then there is a 1/8th probability that a random pea sample of three progeny will have round peas.

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Most popular questions from this chapter

Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?

a. 1:1:1:1

b. 1:3:3:1

c. 1:2:2:1

d. 4:3:2:1

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.

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

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

Which is one of the seven characteristics that Mendel observed in pea plants?

a. flower size

b. seed texture

c. leaf shape

d. stem color
See all solutions

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