OBJECTIVE LIFE SCIENCE
GENETICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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R=round seedr=wrinkled seed.Cross a homozygous round with a wrinkled by creating a punnett square. Which statement predicts the results?
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offspring will be Rr
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offspring will be RR
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round seeds will be recessive to wrinkled
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Wrinkled will be observed in half of offspring
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Explanation:
Detailed explanation-1: -An individual who carries two copies of the same allele (i.e. RR or rr) is called a homozygote (homo = same, zygote = embryo). Homozygotes produce genoctypially identical offspring when allowed to self-fertilize. There are dominant homozygotes (i.e. RR individuals) and recessive homozygotes (i.e. rr individuals).
Detailed explanation-2: -In this case, the percentage of offsprings that will produce round seeds can be calculated using a Punnett square as shown below: Hence, we see that the ratio of round seed: wrinkled seed is 3:1.
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