Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 13, Problem 1VCQ

Figure 13.3 In a test cross for two characteristics such as the one shown here, can the predicted frequency of recombinant offspring be 60 percent? Why or why not?

Chapter 13, Problem 1VCQ, Figure 13.3 In a test cross for two characteristics such as the one shown here, can the predicted , example  1Chapter 13, Problem 1VCQ, Figure 13.3 In a test cross for two characteristics such as the one shown here, can the predicted , example  2

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Summary Introduction

To analyze:

If the predicted frequency of recombinant offspring can be 60 percent or not.

Introduction:

When a cross takes place between the dominant phenotype trait of an organism and a recessive phenotype trait (recessive homozygous genotype) is called a test cross. This is called a test cross because it helps to test the genotype (homozygous or heterozygous) of an organism.

Explanation of Solution

The organism having a dominant trait whose genotype is unknown is crossed with a homozygous recessive trait and then progeny is analyzed. The homozygous parent will produce only one type of gamete, but the heterozygous individuals will produce two types (in the case of monohybrid) and four types of gametes.

It has been found that any progeny with recessive phenotype predicts that heterozygous is the dominant trait; whereas, when the progeny shows all dominant, subsequently the dominant trait had the homozygous dominant trait. Therefore, in a test cross for two characteristics such as the one shown in the mentioned figure the predicted frequency of recombinant offspring will not be 60%. The predicted frequency of recombinant offspring ranges from 0% (for linked traits) to 50% (for unlinked traits).

Conclusion

Hence, it can be concluded that the predicted frequency of recombinant offspring will not be 60% because it ranges from 0-50% in a test cross for two traits like one referred in this figure.

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Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant F1 hybrids were then crossed to generate the F2. In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants of 11 cm high. In a cross between a 29cm plant and a 20cm plant what would be the genotypes giving the smallest number of different phenotypes? specify the phenotypes observed.
Two true-breeding varieties of maize, one 11 cm high and the other 47 cm high were crossed and the resultant  F1 hybrids were then crossed to generate the  F2 . In the F2 there were a total of 13,923 plants with a continuous variation in heights between the two extremes and with only 3 plants as large as 47 cm high and 5 plants  of 11 cm high.SO In a cross between a 29cm plant and a 20cm plant what would be the genotypes giving the smallest number of different phenotypes? specify the phenotypes observed.
What would be the size and genotype of the F1 from a  cross between a true-breeding 11 cm plant and a true-breeding 47 cm plant?
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