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Q3 of 805 Page 1

A colour blind boy is born to a couple with a normal colour vision. Write the genotype of the parents.

Colour blindness is a sex-linked disorder in which the female is generally the carrier. In case of parents who are normal as the colour blindness gene is carried on the X chromosome.

Therefore, the genotype of the parents are:


Father – XY


Mother – XXC.


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25

(a) Geitonogamy and xenogamy, both require pollinating agents, yet they are very different from each other. Explain how.

(b) Describe the characteristics of flowers that are pollinated by wind.


OR


Explain the process of development of a mature human female gamete from the time it is initiated till the formation of ootid.


1

Name the condition in vertebrates where the body attacks self-cells.

4

Mention any two conditions that enhance the chances of syngamy in organisms exhibiting external fertilization.

6

Plants like potato, sugarcane do not require seeds for producing new plants. How do they produce new plants ? Give two other examples where new plants are produced in the same way.

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