Question

Select the incorrect statement.

• A. Male fruit fly is heterogametic.
• B. In male grasshoppers 50% of sperms have no sex-chromosome.
• C. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.
• D. Human males have one of their sex chromosome much shorter than the other.

Answer 1

The correct option is C

In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.

The correct option is option C.

The explanation for the correct option:

1. Sex of progeny depends on heterogametic parents
2. In fowl, female is heterogametic and has genotype ZW and male is homogamous and has genotype ZZ.
3. Gamete produce in females is Z and W, while in males gamete produce is Z
4. So the sex of progeny is influenced by females, not males.
5. The progeny form will be ZZ and ZW.
   

Explanations for the incorrect option:

Option A

1. Heterogametic means the organism has a different type of gamete
2. The male fruit fly is heterogametic and has genotype XY.
3. The female fruit fly is homogametic and has genotype XX

Option B

1. In grasshopper males have genotype XO and females have genotype XX
2. The sex of the progeny is influenced by heterogamete parents.
3. 50 percent of sperm receive the X chromosome and 50 percent do not.

Option D

1. Male humans have genotype XY
2. The Y chromosome is shorter than the X chromosome

Final answer: In domesticated fowls, the sex of progeny depends on the type of egg rather than the sperm is the incorrect statement.