A geneticist is studying two traits in corn: kernel color and kernel appearance

Question

A geneticist is studying two traits in corn: kernel color and kernel appearance or shine The R/r alleles determine kernel color (R purple color: r yellow colon. The w/w alleles determine kernel shine' waxy; w -dull). The geneticist crosses two corn plants that are Rr Ww and Rr ww. The following offspring were obtained from the cross: 215 purple and waxy, 175 purple and dull, 52 yellow and waxy, and 70 ye and dull. 15. What phenotypic ratio is expected from these two parents? Show your work in the space below. 16. How many offspring were expected for each phenotype class? Show your work in the space below.

Explanation / Answer

R- Purple/ r- yellow    W-Waxy / w - Dull

Expected Phenotypic ratio - 3 (Purple Waxy):3 (Purple Dull):1(Yellow Waxy) :1 (Yellow Dull)

2. Total progeny 512

Expected 3/8 X 512 = 192 Purple Waxy

               3/8 X 512 = 192 Purple Dull

               1/8 X 512 = 64   Yellow Waxy

                1/8 X 512 = 64   Yellow Dull

RW Rw rW rw Rw RRWw Purple Waxy RRww Purple Dull RrWw Purple Waxy Rrww Purple Dull rw RrWw   Purple Waxy Rrww Purple Dull rrWw   Yellow Waxy rrww   Yellow Dull

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