Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
(a) double fertilisation
(b) self pollination
(c) cross fertilisation
(d) no fertilisation
NCERT Class X
Science - Exemplar Problems
Chapter_Heredity and Evolution
Answers
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It's c) cross fertilisation
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Two ‘pink coloured flowers’ on crossing resulted in ‘1 red, 2 pink’ and ‘1 white flower progeny’. The ‘nature of the cross’ will be Cross fertilisation.
Option: (c)
Explanation:
- 1 red and ‘1 white flower’ were cross pollinated. The flowers were of pure breed.
- The flowers by Mendelian breed were consisted to be crossed resulting in the formation of 1 red flowers and 1 white flower which are homogeneous breed and the heterogeneous breed is pink in colour since it is heterozygous.
- The 1:2:1 ratio can be obtained by plotting the matrix where each red flower is written as R and the white flower as r.
- On crossing RR belong to the red category and rr consists to be white category whereas Rr is mixed ie pink colour.
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