When will wrinkled seeds appear in a cross between two hybrid round-seeded pea plants?
Answer and explanation
Correct answer: When offspring receive recessive factors from both sides
Let round seed be represented by R, the dominant allele, and wrinkled seed by r, the recessive allele. Two hybrid round-seeded plants have genotype Rr. In the cross Rr × Rr, the possible genotypes are RR, Rr, Rr, and rr. Only rr expresses the recessive wrinkled phenotype, so the seeds appear wrinkled when both parents contribute r; this is about one-fourth of the offspring.
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What is the correct answer to this question?
When offspring receive recessive factors from both sides
Why is this the correct answer?
Let round seed be represented by R, the dominant allele, and wrinkled seed by r, the recessive allele. Two hybrid round-seeded plants have genotype Rr. In the cross Rr × Rr, the possible genotypes are RR, Rr, Rr, and rr. Only rr expresses the recessive wrinkled phenotype, so the seeds appear wrinkled when both parents contribute r; this is about one-fourth of the offspring.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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