Q1 of 55 Page 247

In human males, all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are”

(i) large chromosome


(ii) small chromosome


(iii) Y-chromosome


(iv) X-chromosome

In human males, the 23rd pair of chromosomes, or the sex chromosomal pair, is not perfectly paired, and contains one X and one Y chromosome. This combination determines the gender of the individual.

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25

Why are human beings who look so different from each other in terms of size, colour and look said to belongs to the same species?

 26

Given below is the experiment carried out by Mendel to study inheritance of two traits in garden pea.

(i) Fill in the boxes with appropriate answer.


(ii) Why did Mendel carry out an experiment with two traits?


(iii) What were his findings with respect to inheritance of traits in F1 and F2 generations?


 2

The maleness of a child is determined by:

 3

A zygote which has an X-chromosome inherited from the father will develop into a: