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Principles of Inheritance and Variation

Short Answer Type

11. What is the unique feature of F1 generation ?

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12. What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

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Short Answer Type

13. What do the symbols square and circle in a pedigree chart indicate ?

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14. Define heterogamy. Give an example.

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15. How many chromosomes are found in human cells ?

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Short Answer Type

16. Why is male Drosophila regarded as heterogametic ?

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17. What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

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18. What is name of a cross in which a dominant individual is crossed with a recessive parent?

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Short Answer Type

19. Distinguish between homogametic and heterogametic organisms.

The organisms which produce one type of gametes are called homogametic organisms while the organisms producing two types of gametes are called heterogametic organisms.

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20. Non-disjunction or failure of cytokinesis may lead to zygote containing XXY sex chromosomes. What is the condition called in humans ?

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