What deeper idea is shown by the 3:1 ratio in the second generation of a monohybrid cross?
Answer and explanation
Correct answer: Trait forms remain separate and can segregate into gametes
The 3:1 phenotypic ratio in a typical Mendelian monohybrid F2 generation results from segregation of allele pairs. For example, crossing Aa with Aa gives AA, Aa, Aa and aa in a 1:2:1 genotypic ratio; dominance converts this into three dominant-phenotype offspring and one recessive-phenotype offspring. Thus option A expresses the principle of segregation, whereas B, C and D contradict heredity.
Frequently asked questions
What is the correct answer to this question?
Trait forms remain separate and can segregate into gametes
Why is this the correct answer?
The 3:1 phenotypic ratio in a typical Mendelian monohybrid F2 generation results from segregation of allele pairs. For example, crossing Aa with Aa gives AA, Aa, Aa and aa in a 1:2:1 genotypic ratio; dominance converts this into three dominant-phenotype offspring and one recessive-phenotype offspring. Thus option A expresses the principle of segregation, whereas B, C and D contradict heredity.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
