| A | B |
|---|
| Gregor Mendel is known as the | father of genetics |
| A chromosome is | coiled thread of DNA |
| A gene is | segment of DNA that contains information for a particular trait |
| A trait is | a physical feature |
| An allele is a | form or variety of a gene |
| Dominant genes | control the phenotype or trait |
| Recessive genes | are masked or covered by dominant genes |
| Someone who is heterozygous for a gene has | 2 different alleles (letters) for that gene |
| Someone who is homozygous for a gene has | 2 of the same allele (letter) for that gene |
| Genotype refers to | the actual combination of genes someone has |
| Phenotype refers to | the physical features someone has |
| Genotype controls | phenotype |
| For each gene there are | 2 alleles |
| Gregor Mendel worked with | pea plants |
| Human body cells have | 46 chromosomes |
| Human gametes (sperm or egg) have | 23 chromosomes |
| Genes are inherited from | parents |
| To see a dominant trait in someone they need to have | at least one copy of the dominant gene (one dominant allele) |
| To see a recessive trait in someone they need to have | 2 copies of the recessive gene (2 recessive alleles) |
| Genes that are found on the sex chromosomes (either X or Y) are called | sex-linked |
