Question

A short, yellow male nematode (C.elegans) is mated with a hermaphrodite that is fat and blind....

A short, yellow male nematode (C.elegans) is mated with a hermaphrodite that is fat and blind. All The F1 are short. The F2 has four classes 60 yellow, short; 180 short; 60 fat, blind ; 30 fat, blind,yellow. What is the genotype of the F1 hermaphrodite (female)?

Select one:

a. sh y + + /+ + f b

b. Sh/Sh[fb]; y/+

c. sh y f b

d. Sh/+; y/+ ; +/f; +/b

e. yellow

f. sh +/+ f; y +/+ b

g. Sh/Sh[f]; y/y[b]

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Answer #1

C. elegans has two natural sexes, XO males and XX hermaphrodites. ...

now focus to the problem the given things are -

180 shorts : 60 yellow short : 60 fat blind : 30 fat blind yellow.

when we consider about the offsprin they may have XO male and XX hermaprodite .

here when we considere male only single X is present which carries single pair of characters like yellow [y] and short [sh]. when we consider female , it contains  heterozygous XX combination means having two different pairs of characters on two X chromosome.

therefor the genotype of hermaprodite female is

sh +/+ f; y +/+ b

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