4 - 6. snapdragons are incompletely dominant for color, they have phenotypes red, pink, or white. the red flowers are homozygous dominant, the white flowers are homozygous recessive, and the pink flowers are heterozygous.
give the genotypes for each of the phenotypes, using the letters
\ and
\ for alleles.
a. red snapdragon genotype:____
b. pink snapdragon genotype:____
c. white snapdragon genotype:____
show genetic crosses between the following snapdragon parents, using the punnett squares provided, and record the genotypic and phenotypic percentages below:
a) pink × pink
genotypic %:
rr:____ rr:____ rr:____
phenotypic %:
red:____ pink:____ white:____
b) red × white
genotypic %:
rr:____ rr:____ rr:____
phenotypic %:
red:____ pink:____ white:____
c) pink × white
genotypic %:
rr:____ rr:____ rr:____
phenotypic %:
red:____ pink:____ white:____

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Accepted Answer

# Brief Explanations:
- **Genotypes**:
    - Red snapdragon is homozygous dominant, so its genotype is $RR$.
    - Pink snapdragon is heterozygous, so its genotype is $Rr$.
    - White snapdragon is homozygous recessive, so its genotype is $rr$.
- **Cross a: Pink $×$ Pink ($Rr×Rr$)**
    - **Genotypic ratio**:
        - Using Punnett square: $RR:Rr:rr = 1:2:1$, so genotypic $\%RR = 25\%$, $Rr=50\%$, $rr = 25\%$.
        - **Phenotypic ratio**:
        - Since $RR$ (red), $Rr$ (pink), $rr$ (white), phenotypic $\%$ Red $=25\%$, Pink $=50\%$, White $=25\%$.
- **Cross b: Red $×$ White ($RR×rr$)**
    - **Genotypic ratio**:
        - All offspring are $Rr$, so genotypic $\%RR = 0\%$, $Rr = 100\%$, $rr=0\%$.
        - **Phenotypic ratio**:
        - All $Rr$ (pink), so phenotypic $\%$ Red $=0\%$, Pink $=100\%$, White $=0\%$.
 - **Cross c: Pink $×$ White ($Rr×rr$)**
    - **Genotypic ratio**:
        - Using Punnett square: $Rr:rr=1:1$, so genotypic $\%RR = 0\%$, $Rr = 50\%$, $rr = 50\%$.
        - **Phenotypic ratio**:
        - $Rr$ (pink), $rr$ (white), so phenotypic $\%$ Red $=0\%$, Pink $=50\%$, White $=50\%$.

# Answer:
- **Genotypes**:
    - a. Red snapdragon: $RR$
    - b. Pink snapdragon: $Rr$
    - c. White snapdragon: $rr$
- **Cross a (Pink $×$ Pink)**:
    - Genotypic $\%: RR = 25\%$, $Rr = 50\%$, $rr=25\%$
    - Phenotypic $\%: Red = 25\%$, Pink $=50\%$, White $=25\%$
 - **Cross b (Red $×$ White)**:
    - Genotypic $\%: RR = 0\%$, $Rr = 100\%$, $rr = 0\%$
    - Phenotypic $\%: Red = 0\%$, Pink $=100\%$, White $=0\%$
 - **Cross c (Pink $×$ White)**:
    - Genotypic $\%: RR=0\%$, $Rr = 50\%$, $rr = 50\%$
    - Phenotypic $\%: Red = 0\%$, Pink $=50\%$, White $=50\%$

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