2 In an organism with a chromosome number of 4 homologous ch

2. In an organism with a chromosome number of 4, homologous chromosome diploid 2n pairs Cic2 and DiD2 in Prophase I show below. Assuming no crossing over, after meiosis, four genetically different gametes could be formed due to independent assortment. a. Draw the chromosomes and label the chromosome identity of these four gametes. (9 of 18 points) C1 Prophase I Meiosis I and II D1 C1 D2 Gamete 4 Gamete 3 Gamete 2 Gamete 1. b. What is the probability of generating each of these four gametes? of 18 points) 25% c. If spermatogenesis and oogenesis of this organism produce sperms and eggs as above, 1) What is the probability of a zygote containing chromosome sets as \"Cic2DIDI of 18 points) 2/16 2) What is the probability of a zygote containing chromosome sets as \"C2C2D2D2 of 18 points)

Solution

Answer:

Different combination are formed

Zygote is formed by fusion of two different gametes

Gamete 1 = C1D1

Gamete 2 = C1D2

Gamete 3= C2D1

Gamete 4= C2D2

Possible combination in zygote after fertilization

C1C1D1D1,    C1C1D1D2,    C1C2D1D1,     C1C2D1D2

C1C1D2D1,    C1C1D2D2,    C1C2D2D1,    C1C2D2D2

C2C2D1D1,    C2C2D1D2, C2C2D1D1,   C2C2D1D2

C2C2D2D1,   C2C2D2D1, C2C2D2D2, C2C1D2D2

1) 2/16,    is the probability   for C1C2D1D1

2) 1/16, is probability for C2C2D2D2