Question

4 two dogs that are heterozygous for black fur (bb) are crossed. black (b) is dominant over brown (b). fill in the punnett square for the resulting offspring. indicate the genotypes and phenotypes and phenotype ratio of the offspring.

genotype ___________ phenotype ___________
phenotype ratio _____________
5 two pepper plants that are heterozygous for red (rr) peppers are crossed. red (r) is dominant over yellow (r). fill in the punnett square for the resulting offspring. indicate the genotypes and phenotypes and phenotype ratio of the offspring.

genotype ___________ phenotype ___________
phenotype ratio _____________
6 two cats that are heterozygous for green eyes (gg) are crossed. green (g) is dominant over blue (g). fill in the punnett square for the resulting offspring. indicate the genotypes and phenotypes and phenotype ratio of the offspring.

genotype ___________ phenotype ___________
phenotype ratio _____________

Explanation:

Question 4 Step1: Set up Punnett square

Place parental alleles (B, b) on axes.

Question 4 Step2: Combine alleles

Cross each row/column allele pair:
$B \times B = BB$, $B \times b = Bb$, $b \times B = Bb$, $b \times b = bb$

Question 4 Step3: Identify genotypes/phenotypes

BB/Bb = black (dominant), bb = brown (recessive)

Question 4 Step4: Calculate phenotype ratio

3 black : 1 brown

Question 5 Step1: Set up Punnett square

Place parental alleles (R, r) on axes.

Question 5 Step2: Combine alleles

Cross each row/column allele pair:
$R \times R = RR$, $R \times r = Rr$, $r \times R = Rr$, $r \times r = rr$

Question 5 Step3: Identify genotypes/phenotypes

RR/Rr = red (dominant), rr = yellow (recessive)

Question 5 Step4: Calculate phenotype ratio

3 red : 1 yellow

Question 6 Step1: Set up Punnett square

Place parental alleles (G, g) on axes.

Question 6 Step2: Combine alleles

Cross each row/column allele pair:
$G \times G = GG$, $G \times g = Gg$, $g \times G = Gg$, $g \times g = gg$

Question 6 Step3: Identify genotypes/phenotypes

GG/Gg = green (dominant), gg = blue (recessive)

Question 6 Step4: Calculate phenotype ratio

3 green : 1 blue

Answer:

Question 4:

Punnett Square:

	B	b
b	Bb	bb

Genotypes: BB, Bb, bb
Phenotypes: Black fur, Brown fur
Phenotype Ratio: 3:1

Question 5:

Punnett Square:

	R	r
r	Rr	rr

Genotypes: RR, Rr, rr
Phenotypes: Red peppers, Yellow peppers
Phenotype Ratio: 3:1

Question 6:

Punnett Square:

	G	g
g	Gg	gg

Genotypes: GG, Gg, gg
Phenotypes: Green eyes, Blue eyes
Phenotype Ratio: 3:1