Consider the following crosses in Drosophila. The two traits being investigated involve eye color and the presence or absence of wing crossveins. The outcomes of four crosses are shown below.› **Table Explanation:**The table presents the offspring from four different parental crosses, focusing on two traits: eye color (orange or red) and wing vein type (crossveins or crossveinless).- **Columns:** - "Parents of cross": Describes the phenotypes of the parental generation. - "Number of offspring of each phenotype": Lists the count of offspring for each combination of traits. - "orange, crossveins" - "orange, crossveinless" - "red, crossveins" - "red, crossveinless"- **Rows:** 1. Cross between two orange, crossveined parents: - Offspring: 83 orange, crossveins; 26 orange, crossveinless 2. Cross between a red, crossveined and a red, crossveinless parent: - Offspring: 20 orange, crossveins; 18 orange, crossveinless; 65 red, crossveins; 63 red, crossveinless 3. Cross between a red, crossveinless and a red, crossveined parent: - Offspring: 0 orange, crossveins; 0 orange, crossveinless; 71 red, crossveins; 81 red, crossveinless 4. Cross between two red, crossveined parents: - Offspring: 28 orange, crossveins; 11 orange, crossveinless; 93 red, crossveins; 34 red, crossveinless**Questions:**(a) Which eye color is dominant and which is recessive?(b) Which wing vein type is dominant and which is recessive?(c) What is the most likely genotype of each parent for each of the four crosses?

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Description: Consider the following crosses in Drosophila. The two traits being investigated involve eye color and the presence or absence of wing crossveins. The outcomes of four crosses are shown below.› **Table Explanation:**The table presents the offspring fr

Answered: (a) (b) (c) Parents of cross orange,…

Human Anatomy & Physiology (11th Edition)

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Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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Consider the following crosses in Drosophila. The two traits being investigated involve eye color and the presence or absence of wing crossveins. The outcomes of four crosses are shown below.›

**Table Explanation:**

The table presents the offspring from four different parental crosses, focusing on two traits: eye color (orange or red) and wing vein type (crossveins or crossveinless).

- **Columns:**
- "Parents of cross": Describes the phenotypes of the parental generation.
- "Number of offspring of each phenotype": Lists the count of offspring for each combination of traits.
- "orange, crossveins"
- "orange, crossveinless"
- "red, crossveins"
- "red, crossveinless"

- **Rows:**
1. Cross between two orange, crossveined parents:
- Offspring: 83 orange, crossveins; 26 orange, crossveinless
2. Cross between a red, crossveined and a red, crossveinless parent:
- Offspring: 20 orange, crossveins; 18 orange, crossveinless; 65 red, crossveins; 63 red, crossveinless
3. Cross between a red, crossveinless and a red, crossveined parent:
- Offspring: 0 orange, crossveins; 0 orange, crossveinless; 71 red, crossveins; 81 red, crossveinless
4. Cross between two red, crossveined parents:
- Offspring: 28 orange, crossveins; 11 orange, crossveinless; 93 red, crossveins; 34 red, crossveinless

**Questions:**

(a) Which eye color is dominant and which is recessive?

(b) Which wing vein type is dominant and which is recessive?

(c) What is the most likely genotype of each parent for each of the four crosses?

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Answer

a) Because no Red eye offsprings may be produced from parents who have orange eyes, orange is a recessive trait. Orange parent offspring are also possible in cases of red eyes. Red eyes therefore are dominate.

b)Crossveinless is recessive because all offspring of parents who are only crossveins have a 1/4 phenotypic ratio. Crossvein is therefore dominating.

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