Question

1. in pea plants purple flowers are dominant to white flowers.

if two white flowered plants are cross, what percentage of their offspring will be white
flowered?

1. a white flowered plant is crossed with a plant that is heterozygous for the trait.

what percentage of the offspring will have purple flowers?

1. two plants, both heterozygous for the gene that controls flower color are crossed.

what percentage of their offspring will have purple flowers?
what percentage will have white flowers?

1. in guinea pigs, the allele for short hair is dominant.

what genotype would a heterozygous short haired guinea pig have?
what genotype would a purebreeding short haired guinea pig have?
what genotype would a long haired guinea pig have?

Explanation:

Step1: Determine genotypes

Let \(P\) represent the dominant allele (purple flowers) and \(p\) represent the recessive allele (white flowers). White - flowered plants have the genotype \(pp\).

Step2: Analyze cross \(pp\times pp\)

When two white - flowered plants (\(pp\times pp\)) are crossed, using the Punnett square:

	\(p\)	\(p\)
\(p\)	\(pp\)	\(pp\)

All offspring have the genotype \(pp\).

Step1: Determine genotypes

White - flowered plant has genotype \(pp\), heterozygous plant has genotype \(Pp\).

Step2: Analyze cross \(Pp\times pp\)

Using the Punnett square:

	\(P\)	\(p\)
\(p\)	\(Pp\)	\(pp\)

The genotypes of the offspring are \(Pp\) (purple) and \(pp\) (white) in a \(1:1\) ratio.

Step1: Determine genotypes

Both heterozygous plants have genotype \(Pp\).

Step2: Analyze cross \(Pp\times Pp\)

Using the Punnett square:

	\(P\)	\(p\)
\(p\)	\(Pp\)	\(pp\)

The genotypes are \(PP:Pp:pp = 1:2:1\). Purple - flowered plants (\(PP\) and \(Pp\)): \(\frac{1 + 2}{4}=\frac{3}{4}=75\%\), white - flowered plants (\(pp\)): \(\frac{1}{4} = 25\%\)

Step1: Define alleles

Let \(S\) be the dominant allele (short hair) and \(s\) be the recessive allele (long hair)

Step2: Determine genotypes

• Heterozygous short - haired: \(Ss\) (has one dominant and one recessive allele)
• Pure - breeding short - haired: \(SS\) (homozygous dominant)
• Long - haired: \(ss\) (homozygous recessive)

Answer:

100%