Question

Based on Mendel’s experiment show the cross between round, yellow seeds of pea plant (RRYY) with wrinkled and green seeds of pea plant (rryy) upto F₂ generation. Write the number of seeds/plants with following genetic (Genotype) makeup in F₂ generation:

1. RRYY
2. rryy

Answer 1

Parental cross:

RRYY (round, yellow) × rryy (wrinkled, green)

F₁: all RrYy (round, yellow).

F₁ × F₁ (RrYy × RrYy) → F₂:

For each locus separately:

RR : Rr : rr = 1 : 2 : 1 and

YY : Yy : yy = 1 : 2 : 1

Combine (multiply probabilities): RRYY

= (`1/4` for RR) × (`1/4` for YY) = `1/16`

rryy = (`1/4` for rr) × (`1/4` for yy) = `1/16`

So in the F₂ (16 offspring total):

1. RRYY = 1 plant `(1/16)`
2. rryy = 1 plant `(1/16)`