In corn, the alleles C and c result in colored versus colorless seeds, Wx and wx in nonwaxy versus waxy endosperm, and Sh and sh in plump versus shrunken endosperm. When plants grown from seeds heterozygous for each of these pairs of alleles were testcrossed with plants from colorless, waxy, shrunken seeds, the following phenotypes of progeny were observed. Assume that interference in each interval is complete, so that the map distance in centimorgans (cM) corresponds to the percent recombination.

colorless, nonwaxy, shrunken

84

colorless, nonwaxy, plump

974

colorless, waxy, shrunken

20

colorless, waxy, plump

2,349

colored, waxy, shrunken

951

colored, waxy, plump

99

colored, nonwaxy, shrunken

2,216

colored, nonwaxy, plump

15

Total

6,708

What is the order of the three genes? Explain your answer.

What is the genotype of the triply heterozygous parent with the genes written in correct order?

Construct a linkage map showing the genetic distances between adjacent genes. Explain your answer.

In corn, the alleles C and c result in colored versus colorless seeds, Wx and wx in nonwaxy versus waxy endosperm, and Sh and sh in plump versus shrunken endosperm.

a. c, sh, wx

b. 55+61+5+3 = 124/1000 x 100

= 12.4 mu

c. 55+61+10+6+105+98 = 335/1000 x 100

= 33.5 mu

d. 105+98+5+3=211/1000 x 100 = 21.1 mu

e. c ---12.4---sh-----21.1---wx (total: 33.5)

f. E= (0.124 x 0.211) x 1000 = 26

C = O/E = 8/26 = 0.308

I = 1-C = 1 – 0.308 = 0.692 or 69.2% .

What is endosperm and its function?

Endosperm is a tissue present inside the seeds of most angiosperms following double fertilization. It is rich in carbohydrates, proteins and lipids and provides nourishment to the growing embryo.

Thus, these are the asnwer.

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