8. While vermilion is X-linked and brightens the eye color, brown is an autosomal recessive mutation that darkens the eye. Flies carrying both mutations lose all pigmentation and are white-eyed. Predict the Fl and F2 results of the following crosses: a) vermilion females X brown males b) brown females X vermilion males
8. While vermilion is X-linked and brightens the eye color, brown is an autosomal recessive mutation that darkens the eye. Flies carrying both mutations lose all pigmentation and are white-eyed. Predict the Fl and F2 results of the following crosses: a) vermilion females X brown males b) brown females X vermilion males
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
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### Gene Mutation and Eye Color in Flies: A Study of X-Linked and Autosomal Recessive Traits
#### Understanding Vermilion and Brown Eye Mutations
Eye color mutations in flies can provide significant insights into genetic inheritance patterns. Below, we explore the vermilion and brown mutations and predict the results of specific crosses.
**Vermilion Mutation:**
- **Inheritance:** X-linked
- **Effect:** Brightens eye color
**Brown Mutation:**
- **Inheritance:** Autosomal recessive
- **Effect:** Darkens eye color
Flies carrying both mutations lose all pigmentation and appear white-eyed.
#### Genetic Cross Predictions
To predict the F1 and F2 generations from specific genetic crosses, we evaluate the following scenarios:
1. **Crossing vermilion females with brown males:**
- **F1 Generation:**
2. **Crossing brown females with vermilion males:**
- **F1 Generation:**
The results encompass multiple potential combinations due to the differing inheritance patterns (X-linked versus autosomal recessive). We assume the wild-type allele is dominant over the mutant allele.
---
*Note: The detailed Punnett squares and genetic diagrams illustrating expected phenotypic ratios would provide additional clarity for students studying genetics.*
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