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Honors Week 7
Punnett Squares and blood type
| Question | Answer |
|---|---|
| ABO blood type | a classification system for the antigens of human blood; used in blood transfusion therapy |
| Allele | an alternative form of a gene |
| Autosome | A chromosome that is not directly involved in determining gender |
| Carrier | An individual who is heterozygous for a recessive gene that predisposes for a hereditary disease. |
| Codominant | phenotypic situation in which both alleles are expressed in the heterozygote. |
| Dominant | trait that is expressed when its allele is homozygous or heterozygous. |
| F1 generation | resulting immediately from a cross of the first set of parents |
| F2 generation | the result of a cross between two F1 individuals |
| Fertilization | Sexual reproduction. The combination of the egg and sperm. |
| Gene | The genetic information in the chromosomes that determines a trait |
| Genetics | The study of the patterns of inheritance of specific traits. |
| Genotype | The combination of or genes that represent a particular trait. |
| Heterozygous | Having two different alleles for a specific trait. |
| homologous chromosomes | chromosomes that are similar in shape, size, and the genes they carry. |
| Homozygous | Having two of the same alleles for a specific trait. |
| incomplete dominance | neither allele is dominant; a blending of the two create a new phenotype |
| independent assortment | Mendel's second law, stating that each allele pair segregates independently during gamete formation |
| inheritance | the acquisition of traits genetically transmitted from parents to offspring |
| multiple allele | Typically, there are only two alleles for a gene in a diploid organism. The presence of multiple alleles is best illustrated by the ABO blood group system |
| phenotype | The physical characteristics or observable traits from the genotype. |
| Punnett Square | Shows how genes combine. Shows the probability of genotypes |
| Recessive | Hidden trait. Two recessive traits will show that trait. |
| test cross | Breeding of an organism of unknown genotype with a homozygous recessive individual to determine the unknown genotype. |