Write notes on—
(a) Adam's apple.
(b) Secondary sexual characters.
(c) Sex determination in the
unborn baby
Answers
Answer:
(a) Adam’s apple: During puberty, a change in the voice of boys and girls takes place due to increase in the size of the voice box or larynx. In boys, the voice box tends to protrude out on the upper part of the neck, below the chin and is often referred to as Adam’s apple.
(b) Secondary sexual characters: Those characters which are visible more apparently and help in distinguishing a male from a female are called secondary sexual characters. For example, in girls, breasts and in boys, facial hair, i.e., moustache and beard.
c) Sex determination in the unborn baby: The sex of a child, i.e., whether it is a male or a female is determined at the time of fertilisation when a male gametes fuse with a female gamete. All human beings have 23 pairs of chromosomes in the nuclei of their cells. Two chromosomes out of these are sex chromosomes. A female has two X chromosomes, while a male has one X and one Y chromosome. The gametes (egg and sperm) have only one set of chromosomes. The unfertilised egg always has one X chromosome.
But sperms are of two kinds—One having X chromosome, and the other having Y chromosome. When a sperm containing X chromosome fertilises the egg, the zygote would have two X chromosomes and develop into a female child. If the sperm contributes a Y chromosome to the egg or ovum at fertilisation, the zygote would develop into a male child. It is thus also clear that the sex chromosomes of the father determine the sex of an unborn baby.
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Write notes on:-
Adam's Apple :Adam's Apple is a proturling Part in the throat of boys it is the enlarged voice box or larynx, which begins to goow at Puberty.
Secondaray sexual characters: Secondary sexual characters are the Characters which distinguish a boy from a girl. Characters like hair on chest, under the arms, development of beard are some of the Secondary Sexual characters.
Sex determination in the unborn baby: The Sex determination of an unborn baby depends upon the sex chromosomes of the father. An unfertilised always, have 'x' chromosomes. If a sperm contributes 'x' chromosomes then the baby will be female and if the sperm contributes 'y' chromosomes then the baby will be male.