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Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.
What are the chromosomes XY and XX known as?
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?
Define the following:
Sex-linked characters
Answer the following question:
How is sex determined in human beings? Explain with the help of a diagram.
What is parthenogenesis?
How is sex determined in human beings?
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
The belief that the mother is completely responsible for the sex of the child is wrong because the child
Female heterogamy is shown by
