A flower species undergoes normal segregation and independent assortment. A gene

Question

A flower species undergoes normal segregation and independent assortment. A geneticist decides to cross one plant homozygous dominant for height, seed color, and petal size, with one that is heterozygous for height and homozygous recessive for seed color and petal size (consider this the P_1generation). If two genotypically different plants of the resulting F_1 generation are crossed (F_1A times F_1B), what is the probability that an F_2 plant is homozygous dominant for height, seed color, and petal size?

Explanation / Answer

For a trihybrid cross, the phenotypic ratio of the F2 is 27:9:9:9:3:3:3:1.

Homozygous dominant for height , seed colour and petal size is 27 out of 64.

Probability is number of favourable outcomes/ total number of outcomes.

P = 27/64

P = 0.421875

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