[17.2/4] monohybrid + dihybrid inheritance Flashcards
1
Q
what does it mean for the phenotype offspring if the alleles are GG, Gg and gg, where green is dominant and yellow is recessive?
A
- GG = green
- Gg = green
- gg = yellow
2
Q
what is the difference between the genotype and gamete? (eg. for GG and gg)
A
- parental genotype = GG / gg
- gamete is what is produced by each parent = G, G / g, g
3
Q
how do you find the F1?
A
- punnett square with 4 separate alleles
- cross to find alleles of offspring
4
Q
what is F2?
A
- when F1 offspring are bred
- resulting phenotypes may be different
5
Q
what is an example of dihybrid inheritance with mendel’s peas?
A
- seed shape: round shape is dominant to wrinkled shape
- seed colour: yellow colour is dominant to green colour
6
Q
F1 for dihybrid inheritance
A
- have 2 sets of parental phenotypes which have 4 letters each
- find gametes from these (somehow)
- find offspring genotype
parental genotype = RRGG, rrgg
gametes = RG, rg
offspring (F1) gentyopes = RrGg
7
Q
F2 for dihybrid inheritance with 2 heterozygous parents
A
- big 16 grid
- 4 possible offspring phenotypes
- ratio of offspring (F2) phenotypes = 9:3:3:1
gametes = RG, Rg, rG, rg
8
Q
F2 for dihybrid inheritance with 2 homozygous recessive parents
A
- big 16 grid
- 4 possible offpsring phenotypes
gametes = Rg, Rg, rg, rg
