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Science Grade 9
Genetics
| Question | Answer |
|---|---|
| Genotypic ratio | # of homozygus dominant: # of heterozygus: # of homozygus reccesive |
| Phenotypic ratio: | # of dominant trait: # of recessive trait |
| Is it possible for a trait to skip a generation? | Yes |
| What is a dihybrid cross? | diagram that shows 2 traits on different chromosomes at the same time. ex: yellow/green: round/wrinkled |
| How to determine the gametes on a dihybrid cross: | FOIL: first, outside, inside, last |
| Incomplete Dominance: | heterozygotes show a blending of traits, 3 phenotypes, and it uses two capital letters for the phenotype |
| Co-Dominance: | both alleles are expressed (no blending) in the heterozygote, also uses capital letters |
| square in pedigree: | male |
| circle in pedigree: | female |
| filled in in pedigree: | have trait |
| not filled in in pedigree: | doesn't have trait |
| crossed out in pedigree: | person has died |
| autosomal dominant pedigree: | affected children have affected parents, trait can't skip generation, equal amount of males and females can have trait |
| autosomal recessive pedigrees: | trait can skip a generation. unaffected parents can have affected child. |
| sex-linked pedigrees: | -affects mostly males -affected males inherit trait from mom (only pedigree that affects mostly males) |
Created by:
acuda25