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Question

Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring were analysed. Which of the following statements about this situation is correct?

A
Both parents are homozygotes.
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B
The offspring are either all homozygotes or all heterozygotes
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C
The offspring represent the F1 generation and the gametes produced by the offspring will carry only one allele for this gene
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D
All of the above
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Solution

The correct option is D All of the above
Given that both parents are true-breeding, the cross must be either AA×AA, AA×aa, or aa×aa. If you work out these crosses, you will see that all of the possible answers are true for each possible situation.

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