Use the words 'homozygous', 'heterozygous, dominant
and 'recessive' (where suitable) to describe the following allele combinations: Aa, AA, aa.

1) Aa refers to the heterozygous of the genes. In this gene, both allele are different from one another.

2) AA is a gene which is homozygous in nature. Homozygous means that both allele are the same. Capital letters i. e. AA is used for the trait that is dominant.

3) aa is a gene which is homozygous in nature. Lower case letters i. e. aa is refer for the trait that is recessive.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.

satellites are frequently used to make observations of the orbit on earth