Question

1. the female dog has black fur. the male dog has black fur. figure out the phenotypes and genotypes of their possible puppies by using a punnett square.

% of possible genotypes:
ff: ______
ff: ______
ff: ______
genotypic ratio - __ : : __
% of possible phenotypes
black fur: ______
grey fur: ______
phenotypic ratio - __ : __

1. the female dog is heterozygous. the male dog is heterozygous. figure out the phenotypes and genotypes of their possible puppies by using a punnett square.

% of possible genotypes:
ff: ______
ff: ______
ff: ______
genotypic ratio - __ : : __
% of possible phenotypes
black fur: ______
grey fur: ______
phenotypic ratio - __ : __

Explanation:

Problem 4

Step 1: Determine Genotypes of Parents

Since both dogs have black fur, we assume black fur is dominant (F) and grey is recessive (f). Let's assume both parents are homozygous dominant (FF) (a common case for black fur if no other info). So female: FF, male: FF.

Step 2: Set Up Punnett Square

	F	F
F	FF	FF

Step 3: Calculate Genotype Percentages

All offspring are FF. So FF: 100%, Ff: 0%, ff: 0%. Genotypic ratio: 4:0:0 (simplified as 1:0:0).

Step 4: Calculate Phenotype Percentages

Since FF gives black fur, black fur: 100%, grey fur: 0%. Phenotypic ratio: 4:0 (simplified as 1:0).

Step 1: Determine Genotypes of Parents

Both are heterozygous, so female: Ff, male: Ff.

Step 2: Set Up Punnett Square

	F	f
f	Ff	ff

Step 3: Calculate Genotype Percentages

FF: $\frac{1}{4} = 25\%$, Ff: $\frac{2}{4} = 50\%$, ff: $\frac{1}{4} = 25\%$. Genotypic ratio: 1:2:1.

Step 4: Calculate Phenotype Percentages

FF and Ff give black fur: $25\% + 50\% = 75\%$. ff gives grey fur: $25\%$. Phenotypic ratio: 3:1 (since 75%:25% = 3:1).

Answer:

(Problem 4):

• % of possible Genotypes: FF: 100%, Ff: 0%, ff: 0%
• Genotypic ratio: 1 : 0 : 0
• % of possible Phenotypes: Black Fur: 100%, Grey Fur: 0%
• Phenotypic ratio: 1 : 0

Problem 5