NEET Solved Paper 2019 Question 79
Question: Select the incorrect statement. [NEET 5-5-2019]
Options:
A) In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.
B) Human males have one of their sex-chromosome much shorter than the other.
C) Male fruit fly is heterogametic
D) In male grasshoppers, 50% of sperms have no sex-chromosome.
Show Answer
Answer:
Correct Answer: A
Solution:
Males have both X and Y sex chromosomes. It has been observed that the Y chromosome is much shorter than the X chromosome.
The mechanism of sex determination in which males produce two different types of gametes is called male heterogamety. This is observed in the male fruit fly which produces both X and Y sex chromosomes.
Grasshopper is observed to have the XO type of sex determination in which the males have only one X sex chromosome but the females have two X sex chromosomes.
In case of domesticated fowls, two different types of gametes (with Z or W sex chromosome) are produced by females but the male produces only one kind (with only Z sex chromosome). This kind of sex determination mechanism is called female heterogamety.
