Q21 of 85 Page 286

Give reasons, why the hybrids are generally found to be superior to their parents.

During hybridization, the two parents taken are of the superior class i.e. they are healthy, physically as well as genetically, we have the best genes so that the hybrid produced has the best characters of the two parents of different species.


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19

How does environment determine the sex of a newborn in some organisms?

 20

Give the role of genes in evolution.

 22

(i) A gene can express more than one trait. What gives rise to different expressions?

(ii) When a true breeding pea plant which has yellow seeds is pollinated by a plant that has green seeds, all the F 1 plants have yellow seeds. What might have been the allele for yellow seeds (tell whether it was dominant or recessive / heterozygous or homozygous )?

 23

What do you understand about the independent inheritance of traits?