In a monohybrid cross, what is the usual trait ratio in the second generation?
Answer and explanation
Correct answer: Three is to one
A monohybrid cross follows one pair of contrasting traits. For example, crossing two heterozygous plants, Tt × Tt, gives TT, Tt, Tt and tt in the second generation. Three offspring show the dominant trait and one shows the recessive trait, so the usual phenotypic ratio is 3:1. Therefore option A is correct. The other ratios do not represent the standard Mendelian phenotypic result.
Frequently asked questions
What is the correct answer to this question?
Three is to one
Why is this the correct answer?
A monohybrid cross follows one pair of contrasting traits. For example, crossing two heterozygous plants, Tt × Tt, gives TT, Tt, Tt and tt in the second generation. Three offspring show the dominant trait and one shows the recessive trait, so the usual phenotypic ratio is 3:1. Therefore option A is correct. The other ratios do not represent the standard Mendelian phenotypic result.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Mendel’s laws.
