Non-Mendelian Inheritance -- Practice Problems
a. Draw a Punnett square for the cross that shows this cross. Y y Y YY Yy (yellow) y Yy (yellow) yy (white) b. Why do the phenotypes reflect a 2:1 ratio rather than a 3:1 ratio result from this cross? When the genotype is homozygous dominant, it is lethal so the dominant phenotype is only represented by heterozygous individuals.
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