Q2 of 21 Page 9

Sexual reproduction brings marked variation in the offspring’s while asexual reproduction does not. Why? ( CBSE 2009)

In asexual reproduction, a single parent is involved in reproductions (i.e. through mitotic division), so the chromosomes are not different and there is less variation.


Whereas in sexual reproduction, two parents are involved in reproductions (i.e., through meiotic division), so there are two chromosomes inherited from parents to the offspring leading to variation.

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What is gene? ( CBSE 2014, 2013)

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What is heredity? ( CBSE 2013)

 4 A blue colour flower plant denoted by BB is crossbred with a white colour flower plant denoted by ww.
(a) State the colour of flower we would expect in their F1 progeny.
(b)Write the percentage of plants bearing white flower in F2 generation when the flowers of F1 plants were selfed.
(c) State the expected ratio of the genotype BB and Bw in the F2 progeny. ( CBSE 2013, 2012) 5

A cross was carried out between a pure bred tall pea plant and a pure bred dwarf pea plant and F1 progeny was obtained. Later, the F1 progeny was salted to obtain F2 progeny. Answer the following questions:(a) What is the phenotype of the F1progeny andwhy?

(b) Give the phenotypic ratio of theF2 progeny.


(c) Why is the F2 progeny different from the F1 progeny? ( CBSE 2013, 2012)