What would the genotypic ratio be for a cross between a homozygous dominant individual with a widow’s peak and a heterozygous individual with a widow’s peak?
Understand the Problem
The question asks us to determine the genotypic ratio of offspring resulting from a cross between a homozygous dominant individual (for the widow's peak trait) and a heterozygous individual. This involves understanding basic Mendelian genetics, specifically how genotypes segregate and recombine during sexual reproduction.
Answer
The genotypic ratio is 1:1 (WW:Ww).
The genotypic ratio would be 1:1, with 1/2 of the offspring being homozygous dominant (WW) and 1/2 being heterozygous (Ww).
Answer for screen readers
The genotypic ratio would be 1:1, with 1/2 of the offspring being homozygous dominant (WW) and 1/2 being heterozygous (Ww).
More Information
A Punnett square can be used to determine the possible genotypes of the offspring. In this case, crossing WW with Ww results in WW, WW, Ww, and Ww. Therefore all offspring will express the dominant trait, a widow's peak.
Tips
A common mistake is confusing the genotypic and phenotypic ratios. The genotypic ratio describes the ratio of the different genotypes (e.g., WW, Ww, ww), while the phenotypic ratio describes the ratio of the different physical expressions of the trait (e.g., widow's peak or no widow's peak).
Sources
- If a cross for widow's peak was conducted between a homozygous ... - homework.study.com
- Problem 28 The trait for widow's peak can... [FREE SOLUTION] - Vaia - vaia.com
- Dominant Inheritance - Genetics Generation - knowgenetics.org
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