Question

The genotype for the height of an organism is 'Tt'. What conclusion can be drawn from this?

• A. The allele for height has at least two different genes.
• B. There are at least two different alleles for the gene controlling height.
• C. There are two different genes for height, each having a single allele.
• D. There is one allele for height with two different forms.

Answer 1

The correct option is B There are at least two different alleles for the gene controlling height.

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.