Why can a tall-appearing pea plant not always be considered pure tall?
Answer and explanation
Correct answer: Tallness can appear when the plant has one dominant and one recessive allele.
The governing distinction is between phenotype and genotype. If T is the dominant tall allele and t is the recessive dwarf allele, both TT and Tt plants appear tall. Only TT is pure or homozygous, whereas Tt is hybrid or heterozygous and can pass the recessive t allele to offspring. Since appearance alone cannot distinguish TT from Tt, a tall plant is not necessarily pure. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Tallness can appear when the plant has one dominant and one recessive allele.
Why is this the correct answer?
The governing distinction is between phenotype and genotype. If T is the dominant tall allele and t is the recessive dwarf allele, both TT and Tt plants appear tall. Only TT is pure or homozygous, whereas Tt is hybrid or heterozygous and can pass the recessive t allele to offspring. Since appearance alone cannot distinguish TT from Tt, a tall plant is not necessarily pure. 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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