HEREDITY
MONOHYBRID CROSS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1 out of 4 or 25%
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2 out of 4 or 50%
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3 out of 4 or 75%
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4 out of 4 or 100%
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Detailed explanation-1: -So, the correct option is ‘50%’.
Detailed explanation-2: -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-3: -As shown in the figure a cross between two heterozygous tall plants results in 25% homozygous tall, 50% heterozygous tall and 25% dwarf plants.
Detailed explanation-4: -Answer and Explanation: Since a Tt heterozygous, tall plant produce with equal probabilities the gametes T and t, and the tt homozygous, short plant only t gametes, when they are crossed (Tt x tt) the progeny will be 50% tall (all genotypically Tt) and 50% short (all genotypically tt).
Detailed explanation-5: -Cross between two heterozygous tall pea plants can be shown as follows : Hence, the probability of production of dwarf offsprings is 25% and tall offsprings is 75%.