Q1 of 32 Page 23

Mention the following :

(i) Total number of pairs of chromosomes in each body cell in humans ………………………


(ii) Any two animals having 19 pairs of chromosomes …………………………


(iii) Number of pairs of autosomes in humans ……………………………

(i) Each body cell of human beings except reproductive cells (ovum and sperm) have 23 pairs or 46 chromosomes.

(ii) Lion and tiger have 19 pairs of chromosomes.


(iii) Autosomes are the chromosomes other than the sex chromosomes and are similar in both males and females. In humans, 22 pairs chromosomes are autosomes.


Note: the pair of sex chromosome determines the sex of the individual where “XX” is female and “XY” is male.


More from this chapter

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1

Mention if the following statements are True (T) or False (F) :

(i) Genetics and heredity are the same thing.


(ii) “Like begets like” this applies only to animals.


(iii) The entire human population shows variations.

 2

Which of the following in humans are established genetic traits ? (Tick-mark the correct ones) in the box provided.

(i) Capacity to be a good cricketer


(ii) Curly hair


(iii) Left-handedness


(iv) Quality of voice


(v) Red-green colour blindness

2

A certain couple got only four daughters in a row and no son. Does it mean that the husband does not produce Y-bearing sperms? Explain

 1

Approximately, how many genes have been Discovered in humans?