Explain your answer please. a tetra-hybrid cross involving four traits - seed sh

Question

Explain your answer please. a tetra-hybrid cross involving four traits - seed shape, seed color, pod shape and flower color - two pure-breeding parental plants were crossed: round, yellow, flat pods and purple-flowered (RR GG FF WW) and wrinkled, green, rounded pod and white-flowered (rr gg ff ww). The F1 was then self-crossed to produce F2 plants. What is the probability that the resulting F2 plants will have [round, yellow seeds in flat pods with white flowers] and [wrinkled, green seeds in rounded pods with white flowers]? 10/256 + 4/256 10/256 times 4/256 27/256 + 1/256 27/256 times 1/256 10/256 + 27/256 Humans and Drosophila have functionally analogous eyes. Yet, both share the Pax6 gene, a gene necessary for eye development in all vertebrates. This phenomenon is best described by:

Explanation / Answer

Answer: d). 27.256 + 1/256

RRGGFFWW x rrggffww----------P1

RrGgFfWw (round, yellow, flat & purple)----F1

F1 x F1

RrGgFfWw x RrGgFfWw

Rr x Rr = R_ (3/4) & rr (1/4)

Gg x Gg = G_ (3/4) & gg (1/4)

Ff x Ff = F_ (3/4) & ff (1/4)

Ww x Ww =W_ (3/4) & ww (1/4)

The probability of Round, yellow seeds in flat pods with white flowers genotype = R_G_F_ww = 3/4 * 3/4 * 3/4 * 1/4 = 27/256

The probability of wrinkled, green seeds in rounded pods with white flowers genotype = rrggffww= 1/4 * 1/4 * 1/4 * 1/4 = 1/256

The probability of resulting F2 plants will have (yellow seeds in flat pods with white flowers ) and (wrinkled, green seeds in rounded pods with white flowers)= 27/256 + 1/256

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