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 ?

Answer

(a) (i) X chromosomes (ii) X chromosome (iii) Y chromosome (b) B and D (both are X chromosomes) (c) E (d) Sex chromosomes (e) (i) C (ii) A