Principle of Inheritance and VariationMediumBloom L3
Question
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?
Options
A.9 : 1
B.1 : 3
C.3 : 1
D.50 :50
Solution
Sol.(d) [Key Concept: Test Cross — 1:1 Ratio] Cross: Yy (heterozygous yellow) × yy (green) — this is a TEST CROSS. Gametes from Yy: Y and y (equal frequency). Gametes from yy: only y. Offspring: 1/2 Yy (yellow) : 1/2 yy (green) = 1:1 ratio = 50:50. This 1:1 test cross ratio is the standard outcome of crossing a heterozygote with a homozygous recessive. Options 9:1, 1:3, and 3:1 are not expected from this cross.
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