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Write notes on sex determination in the unborn baby.
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
Name two animals which have nineteen pairs of chromosomes.
Give Reason:
Why X-linked recessive diseases are more common among males than females.
ZW-ZZ system of sex determination occurs in
From the following which option correctly represents the normal genetic constitution of a ovum?
Identify the organism in which ZZ-ZW type of sex determination is observed.
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are ______.
- large chromosome
- small chromosome
- Y-chromosome
- X-chromosome
In humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?
