Question

You cross an individual with genotype XXYYZZ to an individual with genotype xxyyzz, and F1 progeny are collected. Assume interference between regions (X-Y and Y-Z) is 100%. When an F1 individual produces gametes, what proportion of its gametes would have xyz genotype

Answer 1

In the first cross one of the parent has only dominant allele and one has only recessive allele that means the offspring in F1 will be 100% heterozygous

XxYyZz

the gametes resulted from this individual are

XYZ XYz XyZ Xyz xYZ xYz xyZ xyz

it produces 8 types of gamets one of which is xyz the proportion is 1/8