Geneticists use a shorthand notation to refer to the genotyp

Geneticists use a shorthand notation to refer to the genotype of the different individuals with which they are working. For instance, the symbol denoting the recessive allele for the ability to roll your tongue might be written TRR. An individual that is heterozygous for this trait and also carries the wild-type allele might be denoted as ______. Note:

Select all correct answers.

+/TRR

TR+/TRR

TRR/TRR

+/+

TR+/TR+

Solution

In +/TRR the two alleles are \'+\' which denotes wild type, and TRR which is the recessive allele and since both the alleles are different it is heterozygous.

In TR+/TRR the two alleles are \'TR+\' which has one wild type gene (+) and the other recessive (TR). The single wild type gene may confer the wild type trait depending on other factors such as dominance. An individual with these alleles are also heterozygous.

TRR/TRR is homozygous recessive.

+/+ is homozygous wild type.

TR+/TR+ is homozygous.