Study Guide 5 Question 13

Question 1

Flower color in the blue-eyed Mary (Collinsia parviflora) is controlled by two separate genes. The first controls the color of pigment and is called the ‘blue’ gene. The dominant allele (B) produces blue flowers, while recessive alleles (b) produces magenta flowers. This trait exhibits simple dominance, so
heterozygote plants (Bb) also have blue flowers. The second gene, called the ‘white’ gene, produces a compound that is required for the pigment of the B gene to be produced correctly. This trait also exhibits simple dominance, so flowers with genotype FF or Ff will exhibit whatever flower color is indicated by the blue gene. Plants that are homozygous recessive (ff), however, will exhibit no pigmentation in their petals and will produce only white flowers regardless of their genotype at the
blue gene.

What flower color will each genotype listed below produce?
a. BBFF

Answer 1

Blue

Question 2

Flower color in the blue-eyed Mary (Collinsia parviflora) is controlled by two separate genes. The first controls the color of pigment and is called the ‘blue’ gene. The dominant allele (B) produces blue flowers, while recessive alleles (b) produces magenta flowers. This trait exhibits simple dominance, so
heterozygote plants (Bb) also have blue flowers. The second gene, called the ‘white’ gene, produces a compound that is required for the pigment of the B gene to be produced correctly. This trait also exhibits simple dominance, so flowers with genotype FF or Ff will exhibit whatever flower color is indicated by the blue gene. Plants that are homozygous recessive (ff), however, will exhibit no pigmentation in their petals and will produce only white flowers regardless of their genotype at the
blue gene.

What flower color will each genotype listed below produce?
b. Bbff

Answer 2

White

Question 3

Flower color in the blue-eyed Mary (Collinsia parviflora) is controlled by two separate genes. The first controls the color of pigment and is called the ‘blue’ gene. The dominant allele (B) produces blue flowers, while recessive alleles (b) produces magenta flowers. This trait exhibits simple dominance, so
heterozygote plants (Bb) also have blue flowers. The second gene, called the ‘white’ gene, produces a compound that is required for the pigment of the B gene to be produced correctly. This trait also exhibits simple dominance, so flowers with genotype FF or Ff will exhibit whatever flower color is indicated by the blue gene. Plants that are homozygous recessive (ff), however, will exhibit no pigmentation in their petals and will produce only white flowers regardless of their genotype at the
blue gene.

What flower color will each genotype listed below produce?
c. BbFf

Answer 3

Blue

Question 4

Flower color in the blue-eyed Mary (Collinsia parviflora) is controlled by two separate genes. The first controls the color of pigment and is called the ‘blue’ gene. The dominant allele (B) produces blue flowers, while recessive alleles (b) produces magenta flowers. This trait exhibits simple dominance, so
heterozygote plants (Bb) also have blue flowers. The second gene, called the ‘white’ gene, produces a compound that is required for the pigment of the B gene to be produced correctly. This trait also exhibits simple dominance, so flowers with genotype FF or Ff will exhibit whatever flower color is indicated by the blue gene. Plants that are homozygous recessive (ff), however, will exhibit no pigmentation in their petals and will produce only white flowers regardless of their genotype at the
blue gene.

What flower color will each genotype listed below produce?
d. bbFf

Answer 4

Magenta

Question 5

Flower color in the blue-eyed Mary (Collinsia parviflora) is controlled by two separate genes. The first controls the color of pigment and is called the ‘blue’ gene. The dominant allele (B) produces blue flowers, while recessive alleles (b) produces magenta flowers. This trait exhibits simple dominance, so
heterozygote plants (Bb) also have blue flowers. The second gene, called the ‘white’ gene, produces a compound that is required for the pigment of the B gene to be produced correctly. This trait also exhibits simple dominance, so flowers with genotype FF or Ff will exhibit whatever flower color is indicated by the blue gene. Plants that are homozygous recessive (ff), however, will exhibit no pigmentation in their petals and will produce only white flowers regardless of their genotype at the
blue gene.

What flower color will each genotype listed below produce?

e. You own a white flowered-plant and a magenta-flowered plant. Crosses between your two plants always produce blue-flowered plants. What are the genotypes of the parent plants What are the genotypes of the offspring?

Answer 5

we can fill in all the alleles: BBff x bbFF = BbFf