Biology
A pea plant which is homozygous for Green pods which are inflated [GGII] is crossed with a homozygous plant for yellow pods which are constricted [ggii]. Answer the following questions:
(i) Give the phenotype and genotype of the F1 generation. Which type of pollination has occurred to produce F1 generation?
(ii) Write the phenotypic ratio of the F2 generation.
(iii) Write the possible combinations of the gametes that can be obtained if two F1 hybrid plants are crossed.
(iv) State Mendel's law of 'Segregation of Gametes'.
(v) What is the scientific name of the plant which Mendel used for his experiments on inheritance?
Genetics
ICSE 2018
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Answer
(i) Phenotype: All plants with green coloured pods and with inflated pod shape; Genotype: All plants with GgIi.
Cross pollination has occurred to produce F1 generation.
(ii) 9 : 3 : 3 : 1
(iii) GI, Gi, gI, gi
(iv) Mendel's law of 'Segregation of Gametes' states that the two members of a pair of factors separate during the formation of gametes. They do not blend but segregate or separate into different gametes. The gametes combine together by random fusion at the time of zygote formation.
(v) Pisum Sativum.
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