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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 ?

Male Drosophila has XY sex chromosomes and forms two types of gametes , one having X and the other having Y-chromosomes thus it is called 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.

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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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