Question

Pure-bred pea plant A is crossed with pure-bred pea plant B. It is found that the plants which look like A do not appear in F1 generation but re-emerge in F2 generation. Which of the plants A and B are tall and dwarf?

a) ‘A’ is tall and ‘B’ is dwarf.

b) ‘A’ is tall and ‘B’ is also tall.

c) ‘A’ are dwarf and ‘B’ are also dwarf.

d) ‘A’ are dwarf and ‘B’ are tall.

Answer 1

Answer:

(a) F

1

plants: All tall (the dominant trait)

(b) F

2

generation= 3 tall : 1 dwarf

(c) F

1

plants do not exhibit dwarfism as presence of dominant allele (T) in monohybrid (Tt) mask the expression of rececssive allele (t). Two factors for a trait (alleles for tallness and dwarfism), present together in a heterozygous individual (Tt), do not get mixed and are separated during gametogenesis and exhibited in F

2

generation.

Explanation:

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