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Question
Define the following:
Sex chromosomes
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Solution
Sex chromosomes - The chromosomes which determine the sex of an individual are called sex chromosomes.
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RELATED QUESTIONS
Differentiate between ‘ZZ’ and ‘XY’ type of sex-determination mechanisms.
Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?
Which of the following combinations of sex chromosomes produce a male child : XX or XY?
A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes in a sex cell (sperm or ovum) of a human being is most likely to be :
(a) 46
(b) 23
(c) 21
(d) 42
The exchange of genetic material takes place in :
(a) vegetative reproduction
(b) asexual reproduction
(c) sexual reproduction
(d) budding
Choose the correct answer:
Males have more chances of suffering from sex-linked disease because of ___________
Sex is determined in human beings ______.
A zygote which has an X-chromosome inherited from the father will develop into a ______.
Select the incorrect statement
All human chromosomes ate not paired. Most human chromosomes have a maternal and a paternal copy, and we have 22 such pairs. But one pair called the sex chromosomes, is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes. But men have a mismatched pair in which one is normal sized while the other is a short one.
(a) In humans, how many chromosomes are present in a Zygote and in each gamete?
(b) A few reptiles rely entirely on environmental cues for sex determination. Comment.
(c) "The sex of a child is a matter of chance and none of the parents are considered to be responsible for it." Justify it through flow chart only.
OR
(c) Why do all the gametes formed in human females have an X chromosome?
