Advertisements
Advertisements
प्रश्न
Write a short note on sex determination in man.
Advertisements
उत्तर
The difference between two individuals of the same species with respect to heredity is known as sex. So, an individual can either be a male or female in normal circumstances. Scientists have discovered that sex is transmitted by definite sex determination, also called heterosomes. The human body cells have two sex- chromosomes. A woman has two X- chromosomes while a man has one X- chromosome and one Y-chromosome.
Therefore, an egg cell has one X- chromosome and a sperm cell have either an X- or a Y-chromosome. This means that the sex of a baby is determined by the type of sperm cell fertilizing the egg. If an egg, fused with a sperm having Y-chromosome, then the male zygote will develop and when fused with a sperm having an X-chromosome then a female zygote will develop.
APPEARS IN
संबंधित प्रश्न
Explain sex determination in human beings.
ZW-ZZ system of sex determination occurs in
Grasshopper is an example of XO type of sex determination in which the males have ______.
Which of the following determines the sex of a child?
The belief that the mother is completely responsible for the sex of the child is wrong because the child
Fill the blank circles in figure and identify the sex of child A and B.
Sex in honey bee is determined by ______.
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?
How is the sex of a newborn individual determined in different species of animals? Give three examples to support your answer.
