If one allel is dominant and the other is reccesive then the individual is said to be heterozygous. Sorry about the spelling.
homozygous
heterozygous
Alleles
One of the different alleles would be at the same gene locus on each of the paired chromosomes.
DNA is composed of long strings of nucleic acid sequences, but not all of them code for proteins. The ones that do are called genes. Alleles are different versions of a certain gene. For example, the gene that codes for blood type has 3 different alleles, A, B, and O. The genes that code for hair and eye color also have many different alleles.
homozygous
heterozygous
Different versions of the same gene are called
The different molecular versions of the same gene are called alleles.
Homozygous means that both alleles for a gene are the same, designated by two identical letters, such as RR (dominant) or rr (recessive). Heterozygous means that both alleles for a gene are different, designated by two different alleles, such as Rr.
Alleles
Alleles
One of the different alleles would be at the same gene locus on each of the paired chromosomes.
DNA is composed of long strings of nucleic acid sequences, but not all of them code for proteins. The ones that do are called genes. Alleles are different versions of a certain gene. For example, the gene that codes for blood type has 3 different alleles, A, B, and O. The genes that code for hair and eye color also have many different alleles.
alleles
Alleles
No, alleles are different forms of a gene. The gene is the portion of DNA/RNA that codes for a particular trait (chain of proteins). The alleles are the possible code bits that could be in that part of the DNA and different alleles will result in different traits being expressed. E.g., part of your DNA codes for your eye color, and in that part there are a number of different alleles that could be there. A certain allele might make you blue-eyed, while another would make you brown-eyed, etc. This is something of a simplification as many traits are expressed via multiple alleles, but that is the general idea.