Question

1. in pea plants purple flowers are dominant to white flowers. if two white flowered plants are crossed, what percentage of their offspring will be white flowered?
2. a heterozygous round seeded plant (rr) is crossed with a homozygous round seeded plant (rr). what percentage of the offspring will be homozygous (rr)?
3. in guinea pigs, the allele for a rough coat (r) is dominant over the allele for a smooth coat (r). if you have a heterozygous guinea pig (rr) and a homozygous recessive guinea pig (rr), what is the probability of their offspring having smooth coats?

Explanation:

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Problem 4

Step1: Define genotypes for white flowers

White flowers are recessive, so genotype = $rr$ for both parents.

Step2: Set up Punnett square

	$r$	$r$
$r$	$rr$	$rr$

Step3: Calculate white offspring percentage

All 4 offspring are $rr$ (white). Percentage = $\frac{4}{4} \times 100\% = 100\%$

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Problem 5

Step1: Identify parent genotypes

Parent 1: $Rr$, Parent 2: $RR$

Step2: Set up Punnett square

	$R$	$R$
$r$	$Rr$	$Rr$

Step3: Calculate homozygous dominant percentage

2 out of 4 offspring are $RR$. Percentage = $\frac{2}{4} \times 100\% = 50\%$

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Problem 6

Step1: Identify parent genotypes

Parent 1: $Rr$, Parent 2: $rr$

Step2: Set up Punnett square

	$r$	$r$
$r$	$rr$	$rr$

Step3: Calculate smooth coat probability

2 out of 4 offspring are $rr$ (smooth coat). Probability = $\frac{2}{4} = 50\%$

Answer:

1. Problem 4: 100%
2. Problem 5: 50%
3. Problem 6: 50%