If pure tall and pure dwarf pea plants are crossed, which trait usually appears in the first generation?
Answer and explanation
Correct answer: All plants tall
Let pure tallness be TT and pure dwarfness be tt. Each F1 offspring receives T from the tall parent and t from the dwarf parent, so every offspring has genotype Tt. Because T is dominant over t in this Mendelian example, all F1 plants show the tall phenotype. Thus option A is correct; dwarf plants would be expected after a suitable later-generation cross, not in this F1 cross.
Frequently asked questions
What is the correct answer to this question?
All plants tall
Why is this the correct answer?
Let pure tallness be TT and pure dwarfness be tt. Each F1 offspring receives T from the tall parent and t from the dwarf parent, so every offspring has genotype Tt. Because T is dominant over t in this Mendelian example, all F1 plants show the tall phenotype. Thus option A is correct; dwarf plants would be expected after a suitable later-generation cross, not in this F1 cross.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
