In pea plants, the yellow-seed trait is dominant over green. What colour will appear in the first generation if pure yellow and pure green plants are crossed?
Answer and explanation
Correct answer: Yellow
Use Mendel’s dominance principle. Let Y represent the dominant yellow allele and y represent the recessive green allele. Pure yellow has genotype YY, while pure green has genotype yy. Their cross is YY × yy, so every offspring receives Y from the first parent and y from the second, giving genotype Yy. Because Y is dominant, all first-generation seeds will appear yellow. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Yellow
Why is this the correct answer?
Use Mendel’s dominance principle. Let Y represent the dominant yellow allele and y represent the recessive green allele. Pure yellow has genotype YY, while pure green has genotype yy. Their cross is YY × yy, so every offspring receives Y from the first parent and y from the second, giving genotype Yy. Because Y is dominant, all first-generation seeds will appear yellow. Therefore option A is correct.
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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