HEREDITY
MONOHYBRID CROSS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If we cross TT with tt, what is the probability that the offspring will have Tt?
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0%
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50%
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75%
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100%
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Explanation:
Detailed explanation-1: -In a cross between heterozygous tall plants (Tt) and a homozygous dwarf plant (tt), the ratio in the offspring shall be 1 tall : 1 dwarf. This is because the heterozygous plant will make two types of gametes, one type having T allele and the other having t allele. Hence, the correct answer is ‘1 tall : 1 dwarf’
Detailed explanation-2: -So, the correct option is ‘50%’.
Detailed explanation-3: -F2 Genotypic ratio =1 pure tall (TT) : 2 heterozygous tall (Tt) : 1 pure dwarf (tt); thus, the ratio of pure tall to pure short plants will be 1:1.
Detailed explanation-4: -So, the correct option is ‘50% recessive’.
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