Question

Black eyes are dominant to orange eyes, and green skin is dominant to white skin. Sam, a MendAlien with black eyes and green skin, has a parent with orange eyes and white skin. Carole is a MendAlien with orange eyes and white skin. If Sam and Carole were to mate, the predicted phenotypic ratio of their offspring would be _____.A.1 black eyes, green skin : 3 black eyes, white skin : 3 orange eyes, green skin : 9 orange eyes, white skin.B.There is insufficient information to determine Sam's genotype.C.3 black eyes, green skin : 3 black eyes, white skin : 9 orange eyes, green skin : 1 orange eyes, white skin.D.1 black eyes, green skin : 1 black eyes, white skin : 1 orange eyes, green skin : 1 orange eyes, white skin.E.9 black eyes, green skin : 3 black eyes, white skin : 3 orange eyes, green skin : 1 orange eyes, white skin.

Answer 1

D.1 black eyes, green skin : 1 black eyes, white skin : 1 orange eyes, green skin : 1 orange eyes, white skin

Step-by-step explanation:

We have two genes with the following alleles:

• BB or Bb: black eyes
• bb: orange eyes
• GG or Gg: green skin
• gg: white skin

Sam's parent had orange eyes and white skin and must have had the genotype bbgg, so Sam inherited the alleles b and g. But he has black eyes and green skin, therefore Sam is heterozygote for both genes and has the genotype BbGg. He will produce 4 types of gametes: BG, Bg, bG and bg.

Carole has orange eyes and white skin, so her genotype is bbgg. She will produce only bg gametes.

If you do a Punnett Square, you'll get the following offspring:

• 1/4 BbGg: black eyes and green skin
• 1/4 Bbgg: black eyes and white skin
• 1/4 bbGg: orange eyes and green skin
• 1/4 bbgg: orange eyes and white skin