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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

Explain epistasis in terms of its Greek-language roots 鈥渟tanding upon.鈥�

Labrador retrievers鈥� 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

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 12.5In 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?
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