chromosomes structure

chromosome exists in pairs, in males there are 22homologous and 23 pairs which Xy in females all the chromosomes are xx

alleles are different versions of genes

genes are sections of DNA that codes for specific amino acids

TT Dorminant allele -are normally expressed

recessive allele are only expressed when both are homozygous recessive

heterozygous alleles has a dorminant and recessive alleles. only dorminant allele is expressed, recessive allele is suppressed.

Human genome, all of the approximately three billion base pairs of deoxyribonucleic acid (DNA) that make up the entire set of chromosomes of the human