Instructions: Complete the following problems. List the parent genotypes, draw a

Question

Instructions: Complete the following problems. List the parent genotypes, draw and fill in a Punnett square, and then list the offispring genotypes and phenotypes. A homozygous dominant green plant is crossed with a heterozygous green pea plant (yellow is recessive). 1. 2. A homozygous recessive white mouse is crossed with a heterozygous brown mouse. 3. A heterozygous purple pea plant is crossed with a homozygous dominant purple plant (green is recessive). 4. A homozygous recessive white cat is crossed with a homozygous dominant orange cat.

Explanation / Answer

1. In the question it is said that yellow is recessive and green is dominant so generally we represent dominant character with its capital letter and recessive with small letter. So here dominant will be G and recessive will be g (not y).

So now coming to parental genotypes:

Homozygous dominant green plant - GG( because it's homozygous means same alleles)

Heterozygous green plant- Gg ( heterozygous means different allele) note that phenotypes will be green only because in both parents dominant G is present.

Parental: GG × Gg

Gametes: G and G G and g

Now punnett square for F1 generation

GG

Green

Gg

Green

GG

Green

Gg

Green

Offspring genotype: GG , Gg, GG, Gg

Phenotypes are all green out of which two are homozygous dominant green(GG) and two are heterozygous green(Gg)

Gametes G g G

GG

Green

Gg

Green

G

GG

Green

Gg

Green

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