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प्रश्न
Write a short note on sex determination in man.
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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.
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संबंधित प्रश्न
Explain sex determination in human beings.
Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form.
A new born child has an XY pair of chromosmes. Will it be a baby boy or a baby girl?
Name two animals which have nineteen pairs of chromosomes.
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
In XO type of sex determination ______.
If a normal cell of the human body contains 46 pairs of chromosomes then the numbers of chromosomes in a sex cell of a human being is most likely to be ______
Female heterogamy is shown by
Which of the following group shows ZW-ZZ type of sex determination?
How is the sex of a newborn individual determined in different species of animals? Give three examples to support your answer.
