What are the genotypic ratios of progeny resultant from a cross between an 'XXX' and an 'XYY' individual, given that 'XXX' are female and 'XXY', 'XYY', and 'YYY' are male?
Understand the Problem
The question describes a novel sex-determination system and asks for the genotypic ratios of the offspring from a specific cross ('XXX' x 'XYY'). This requires determining all possible allele combinations from the parental gametes and then calculating their ratios.
Answer
The genotypic ratios are XXY:XXX:XYY:XY = 1:1:1:1.
The genotypic ratios of progeny from a cross between an XXX female and an XYY male are: XXY, XXX, XYY, and XY, each with a 1:1:1:1 ratio.
Answer for screen readers
The genotypic ratios of progeny from a cross between an XXX female and an XYY male are: XXY, XXX, XYY, and XY, each with a 1:1:1:1 ratio.
More Information
To determine the genotypic ratios, we consider the possible gametes produced by each parent. The XXX female can produce gametes with either XX or X chromosomes. The XYY male can produce gametes with XY or Y chromosomes. Combining these gives the resultant genotypes.
Tips
A common mistake is to forget to consider all possible combinations of gametes during the cross. Always write out the possible gametes for each parent first to ensure all combinations are accounted for.
Sources
- Answers to All Questions and Problems - press.muni.cz
- Sex chromosomes & X-linked inheritance (article) - khanacademy.org
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