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In peas, dwarf (t) is recessive to tall (T), green (y) is recessive to yellow (Y), and wrinkled (s) is recessive to smooth (S). What is the probability of getting a progeny plant that is phenotypically dwarf, green and smooth, if two plants, each heterozygous for all three genes, are crossed with each other?

Respuesta :

Answer:

3/64

Explanation:

The genotype of two parents= TtYySs x TtYySs

The frequency of "dwarf, green and smooth" can be calculated by calculating the individual frequency and then applying the product rule.

The desired genotype is =dwarf (tt), green (yy) and smooth (Ss or SS).

Tt x Tt = 1/4 TT: 1/2 Tt: 1/4 tt  (dwarf)

Yy x Yy = 1/4 YY: 1/2 Yy: 1/4 yy  (green)

Ss x Ss = 1/4 SS: 1/2 Ss: 1/4 ss (3/4 smooth: 1/4 wrinkled)

The proportion of the progeny with genotype "ttyyS-= 1/4 tt (dwarf) x 1/4 yy (green) x 3/4 (smooth)= 3/64