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A heterozygous yellow round seeded pea plant (YyRr) is test crossed with a green wrinkled seeded plant (yyrr). What phenotypic ratio is expected in the progeny?
A1 : 1 : 1 : 1
B3 : 1
C9 : 3 : 3 : 1
D1 : 2 : 1
Answer & Solution
Correct answer: A. 1 : 1 : 1 : 1
A dihybrid test cross with a fully heterozygous parent yields gametes YR, Yr, yR and yr in equal frequency. Each combines with the yr gamete from the recessive parent, producing four phenotypes in a 1:1:1:1 ratio.
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