How many chromosomes are there in human cell? What are sex chromosomes ? What will be the sex of the offspring if a sperm carrying chromosome X fertilises the egg?

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Solution

There are 23 pairs of chromosomes i.e 46 chromosomes in a human cell. The sex chromosomes are the chromosomes that determine the sex (male or female) of an organism. There is only one pair of sex chromosome in a human cell which may be XX (for female) or XY (for male). If a sperm carrying chromosome X fertilizes the egg than the sex of the offspring will be female (XX). This is because the chromosome of an egg cell will always be X.

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What will be the sex of the child born :

(a) if X chromosome carrying sperm fertilizes an ovum containing X chromosome?

(b) if Y chromosome carrying sperm fertilizes an ovum containing X chromosome?

(a) If a normal human cell has 46 chromosomes , how many chromosomes will be there in a human

(i) sperm cell,

(ii) zygote ?

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