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Question
Observe the checker board and answer the following questions.
i) Write phenotypic ratio of monohybrid cross.
ii) How many heterozygous plants are present in the checker board ?
i) Write phenotypic ratio of monohybrid cross.
ii) How many heterozygous plants are present in the checker board ?
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Solution
(i) We will write the amount of homozygous dominant (YY) and heterozygous (Yy) squares as one phenotypic group. We will count the amount of homozygous recessive (yy) squares as another group. The result as a ratio of the two groups: A count of 3 from one group and 1 from the other would give a ratio of 3:1. Hence, phenotypic ratio would be 3:1(ii) The number of heterozygous plants is 2 i.e Yy and yY.
(i) We will write the amount of homozygous dominant (YY) and heterozygous (Yy) squares as one phenotypic group. We will count the amount of homozygous recessive (yy) squares as another group. The result as a ratio of the two groups: A count of 3 from one group and 1 from the other would give a ratio of 3:1. Hence, phenotypic ratio would be 3:1
(ii) The number of heterozygous plants is 2 i.e Yy and yY.
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