Step-by-Step Solution
The crosses done by the geneticist can be shown in the following way:
A/A/A x a/a
The progeny of A/A/a was selected. These progeny were crossed with a/a. The resulting progeny are tabulated.
The gametic combinations that are possible can be written using numbers for better understanding. The first A is indicated by 1, the second A by 2 and a by 3.
• A/A and a [1, 2, 3]
• A/a and A [1, 3, 2]
• A/a and A [2, 3, 1]
Since only diploid progeny were examined in the cross with a/a, the progeny ratio should be 2:1 wild type: mutant, if the gene is on the trisomic chromosome. Taking this into consideration, the table above indicates that y is on chromosome 1; cot is on chromosome 7 and, h is on chromosome 10.
The genes of c and d do not map to the three chromosomes of 1, 7, and 10.
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