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Chapter 12: Q. 30 (page 328)

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

Short Answer

Expert verified

As a result, the ratios are 1:1:1:1.

Step by step solution

01

Step. 1 Introduction

A genotype is a series of genes that encode in a particular individual's genetic characteristics. The genotypic ratio refers to the ratio that depicts the various genotypes of children out of a test cross.

02

Step. 2 Explanation

You fully understand the genomes of the parents, where you need to differentiate into pair of alleles, both genes, for the cross. AABBCc is divided similarly to ABC and ABc. Aabbcc is divided similarly to Abc and abc. You can now cross them, and the probabilities are: AABbCc, AaBbCc, AABbcc, & AaBbcc. So, 25% of the progeny would be AaBbCc, 25% would be AaBbcc, 25% would be AABbCc, and 25% will be AABbcc.

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Most popular questions from this chapter

Use a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous recessive) and a tall pea plant (heterozygous). What is the phenotypic ratio of the offspring?

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

A farmer raises black and white chickens. To his surprise, when the first generation of eggs hatch all the chickens are black with white speckles throughout their feathers. What should the farmer expect when the eggs laid after interbreeding the speckled chickens hatch?

a. All the offspring will be speckled.

b. 75% of the offspring will be speckled, and 25% will be black.

c. 50% of the offspring will be speckled, 25% will be black, and 25% will be white.

d. 50% of the offspring will be black and 50% of the offspring will be white.

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

Figure 12.12 What ratio of offspring would result from a cross between a white-eyed male and a female that is heterozygous for red eye color?
See all solutions

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