Biology
Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and Terminal flowers with wrinkled seeds (aarr). Study the same and answer the questions that follow:
(i) Give the phenotype of F1 progeny.
(ii) Give the phenotypes of F2 progeny produced upon by the self-pollination of progeny.
(iii) Give the phenotypic ratio of F2 progeny.
(iv) Name and explain the law induced by Mendel on the basis of the above observation.
Genetics
ICSE 2013
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Answer
(i) The phenotype of F1 progeny will be Axial Round as it is dominant phenotype.
(ii) The phenotypes of F2 progeny will be Axial Round, Axial Wrinkled, Terminal Round and Terminal Wrinkled as in F2 generation, recessive trait is also expressed.
(iii) Phenotypic ratio of F2 progeny will be 9:3:3:1.
(iv) Above observation are based on Law of Independent Assortment. This law states that factors or genes controlling different characters assort independently without influencing each other during the formation of gametes.
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