What is the main meaning of the 9:3:3:1 result in a dihybrid cross?
Answer and explanation
Correct answer: Forms of two traits assort independently and produce new combinations
The 9:3:3:1 ratio is the typical phenotypic outcome of a dihybrid cross between two individuals heterozygous for two independently assorting traits, such as AaBb × AaBb. The four phenotype classes occur in the proportions 9, 3, 3 and 1 because allele pairs separate and recombine independently. Thus option A is correct; the other choices deny the presence of two inherited traits or invoke an unrelated idea.
Frequently asked questions
What is the correct answer to this question?
Forms of two traits assort independently and produce new combinations
Why is this the correct answer?
The 9:3:3:1 ratio is the typical phenotypic outcome of a dihybrid cross between two individuals heterozygous for two independently assorting traits, such as AaBb × AaBb. The four phenotype classes occur in the proportions 9, 3, 3 and 1 because allele pairs separate and recombine independently. Thus option A is correct; the other choices deny the presence of two inherited traits or invoke an unrelated idea.
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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