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प्रश्न
Name any two genetic in humans.
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उत्तर
Colour-blindness, Thalassaemia, Sickle cell anaemia and Haemophilia
संबंधित प्रश्न
Explain sex determination in human beings.
There are ................ pairs of chromosomes in the human being.
The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosome D in half of gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, combination of B and E chromosomes produces a male zygote.
(a) What are chromosomes (i) B (ii) D, and (iii) E?
(b) Out of B, D and E, which two chromosomes are of the same type?
(c) Which chromosome is smaller in size?
(d) What is the general name of chromosomes such as B and E?
(e) Out of the two persons A and C, which one is (i) male, and (ii) female?
Differentiate Intersexes from Supersexes.
Sex is determined in human beings ______.
A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
Which of the following statements is not true with respect to variation?
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
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?
Which pair of sex chromosome will determine a male?
