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प्रश्न
Explain how, sex is determined in human babies.
उत्तर
In humans, sex is determined at the time of fertilisation. If the father contributes X chromosome during fertilisation through his sperm, then the baby born will be a girl. On the other hand, if chromosome Y is contributed through his sperm, then the newborn will be a boy.
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संबंधित प्रश्न
Differentiate between 'ZZ' and 'XY' type of sex-determination mechanisms.
Fill in the following blank with suitable word :
The...............chromosomes for a ............are XX whereas that for a ..............are XY.
Which combination of genes in the zygote will produce children with brown eyes?
Choose the correct answer :
Human sex chromosomes are __________
Choose the correct answer:
A single recessive trait, able to express must be on _________
Differentiate Intersexes from Supersexes.
How many ovum are formed when a diploid cell undergoes meiosis, during oogenesis?
Which type of sex determination is observed in honey bee?
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?
