In Mendel's monohybrid cross, the 3:1 result in the second generation points to which basic principle?
Answer and explanation
Correct answer: Forms of a trait segregate into gametes
In a monohybrid cross, the heterozygous F1 generation produces two types of gametes in equal proportions because the two allelic forms separate during gamete formation. Self-pollination then gives genotypes in a 1:2:1 ratio and, with complete dominance, phenotypes in a 3:1 ratio. The reappearance of the recessive phenotype demonstrates segregation. Thus option A is correct; blending would not restore the recessive form.
Frequently asked questions
What is the correct answer to this question?
Forms of a trait segregate into gametes
Why is this the correct answer?
In a monohybrid cross, the heterozygous F1 generation produces two types of gametes in equal proportions because the two allelic forms separate during gamete formation. Self-pollination then gives genotypes in a 1:2:1 ratio and, with complete dominance, phenotypes in a 3:1 ratio. The reappearance of the recessive phenotype demonstrates segregation. Thus option A is correct; blending would not restore the recessive form.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Mendel’s laws.
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