Question

What do the following genetic symbol stand for: AA,Aa

Answer 1

Genetic symbols refers to the set of the symbols that are used for representing various genes, there are various symbols and letters used to represent genes or alleles and it also includes the protocol for nomenclature of genes.

Complete answer:
There are genetic symbols used to understand about genetic information;
Symbol ‘A’ this is capital A that represents the dominant character. So the capital letter always
demonstrates about the dominant trait.
Symbol ‘a’ which is a small a represents the recessive traits.
Symbol ‘AA’ given in the statement above represents homozygous dominant trait and whereas
Symbol ‘Aa’ given in the statement above has heterozygous dominant traits. In this both
recessive and dominant genes are there but only the dominant gene is expressive.
Homozygous and heterozygous are two different terms that are used to describe allele pairs.
Heterozygous: Heterozygous allele states that there are two different copies present of the
allele that code for the same character, it has both dominant and recessive traits. In this dominance
can be complete, incomplete or codominance.
Homozygous: In homozygous there are two same copies of same allele that are coding for same
type of allele. It consists of either a dominant or recessive allele in it.
So our answer is AA stands for homozygous dominant trait and Aa stands for heterozygous
dominant trait or character.

Note: Gene is a short sequence of DNA encoding for a certain trait whereas an alleles are
different variants of a gene. Alleles are mainly responsible for various features of a single trait.
Examples ; if we talk about hairs as a trait then hairs is a gene example and colour of hairs is a
feature of hairs that is stated by alleles.