Multiple choice

If Tall (TT) is cross bred with dwarf (tt), what will be the characteristics of F1 plants?

  1. All tall

  2. Both tall and short

  3. All short

  4. In between tall and short
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A Correct answer
Explanation

When a pure tall plant (TT) is crossed with a dwarf plant (tt), all F1 offspring receive one dominant allele (T) and one recessive allele (t), making them all heterozygous (Tt). Since tallness is dominant over dwarfness, the T allele masks the expression of the t allele, resulting in all F1 plants appearing tall. This demonstrates Mendel's law of dominance. The plants won't be intermediate in height because height in peas shows complete dominance, not incomplete dominance.

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