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 Parental Genotypes

Since both dogs have black fur, we assume black fur is dominant (F) and grey is recessive (f). Let's assume both are homozygous dominant (FF) (a common case if no other info, but we could also consider other dominant cases, but let's take FF for both as a simple start). 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 (or simplified 1:0:0).

Step 4: Calculate Phenotype Percentages

Since F is dominant for black fur, all have black fur. Black Fur: 100%, Grey Fur: 0%. Phenotypic ratio: 4:0 (or 1:0).

Step 1: Determine Parental Genotypes

Female is heterozygous (Ff), male is heterozygous (Ff).

Step 2: Set Up Punnett Square

	F	f
f	Ff	ff

Step 3: Calculate Genotype Percentages

FF: (1/4)100 = 25%, Ff: (2/4)100 = 50%, ff: (1/4)*100 = 25%. Genotypic ratio: 1:2:1 (FF:Ff:ff).

Step 4: Calculate Phenotype Percentages

Black fur (FF or Ff): 25% + 50% = 75%, Grey fur (ff): 25%. Phenotypic ratio: 3:1 (black:grey).

Answer:

% of possible Genotypes:
FF: 100%
Ff: 0%
ff: 0%
Genotypic ratio- 4:0:0 (or 1:0:0)
% of possible Phenotypes
Black Fur: 100%
Grey Fur: 0%
Phenotypic ratio- 4:0 (or 1:0)
(Note: If we assume a different dominant case, like both are Ff, but the problem says both have black fur. If black is dominant, possible genotypes for black can be FF or Ff. But the problem doesn't specify if they are homozygous or heterozygous, but the most straightforward initial assumption is homozygous dominant. If we consider another case where one is FF and one is Ff, but the problem states both have black fur. Let's stick to the simplest case where both are FF as above. However, if we assume both are Ff (but the problem says they have black fur, which is possible as Ff is black), but problem 4 says "the female dog has black fur. The male dog has black fur" – maybe a better assumption is both are FF. But let's check problem 5 which is heterozygous, so problem 4 is likely homozygous dominant (FF x FF).)

Problem 5