Q1 of 21 Page 9

What is gene? ( CBSE 2014, 2013)

A gene is a unit of heredity or DNA which are transferred from parents to their off-springs during the process of reproduction.

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2

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

 3

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)