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Question

The genotype for the height of an organism is 'Tt'. What conclusion can be drawn from this?
  1. The allele for height has at least two different genes.
  2. There are at least two different alleles for the gene controlling height.
  3. There is one allele for height with two different forms.
  4. There are two different genes for height, each having a single allele.

A
There are at least two different alleles for the gene controlling height.
B
There are two different genes for height, each having a single allele.
C
The allele for height has at least two different genes.
D
There is one allele for height with two different forms.
Solution
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An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. The heterozygous organism (Tt) shows that it has two alleles (T - tall and t - dwarf) for a single gene (the gene that controls height).
So, the correct option is B.

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