Question

What does the allele notation tt mean to geneticists?

a. two dominant alleles
b. two recessive alleles
c. at least one dominant allele
d. one dominant allele and one recessive allele

Answer 1

B)

The allele notation tt means two recessive alleles to geneticists. The lowercase letter t represents a recessive allele, while the uppercase letter T represents a dominant allele. Therefore, tt indicates that an individual has two copies of the recessive allele for a particular gene. This means that the individual will express the corresponding recessive trait since there are no dominant alleles present to mask its expression.