| A | B |
|---|
| Fertilized egg | 23 pairs of chromosomes |
| First 22 pairs of chromosomes | Autosomes |
| Genes that make up a person's heredity | Genotype |
| Physical, behavioral and Psychological features | Phenotype |
| When two alleles are the same | Homozygous |
| When two alleles are different | Heterozygous |
| Chemical instructions that are ignored | recessive allele |
| From a single fertilized egg that splits in two | Monozygotic twins |
| Two separate eggs fertilized by two separate sperm | Dizygotic twins |
