Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
![**Drosophila Genetics: Understanding Gene Linkage and Recombination**
In Drosophila, two specific genes are located on the second chromosome:
- **Flight Gene**: The dominant allele (F) allows flight, while the recessive allele (f) results in non-flying.
- **Eye Color Gene**: The dominant allele (R) gives red eyes, whereas the recessive allele (r) gives brown eyes.
**Genetic Cross Experiment:**
1. Flies with the genotype FR/FR are crossed with flies of the fr/fr genotype.
2. The offspring from this cross are then crossed again with flies that are fr/fr.
**Results from the Cross:**
- Flies that can fly and have red eyes: 50
- Flies that cannot fly and have brown eyes: 45
- Flies that can fly and have brown eyes: 5
- Flies that cannot fly and have red eyes: 7
**Questions:**
(A) Which of the above offspring are recombinant?
(B) What is the map distance between the genes?
---
**Analysis:**
- **Parental Types**: Offspring showing the original phenotypes of the parents (fly with red eyes, non-fly with brown eyes).
- **Recombinant Types**: Offspring showing new combinations of traits (fly with brown eyes, non-fly with red eyes).
For question (A), identify the recombinant phenotypes based on observed new trait combinations.
For question (B), calculate the map distance using the formula:
\[ \text{Map distance (in centimorgans)} = \left( \frac{\text{Number of recombinant offspring}}{\text{Total number of offspring}} \right) \times 100 \]
Understanding these concepts is crucial for studying genetic linkage and chromosomal behavior.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F07b00a25-4bbc-4603-8563-821c16d74641%2F0bdfea21-8a84-4e8b-b020-6295d8477355%2Frpgyicc_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Drosophila Genetics: Understanding Gene Linkage and Recombination**
In Drosophila, two specific genes are located on the second chromosome:
- **Flight Gene**: The dominant allele (F) allows flight, while the recessive allele (f) results in non-flying.
- **Eye Color Gene**: The dominant allele (R) gives red eyes, whereas the recessive allele (r) gives brown eyes.
**Genetic Cross Experiment:**
1. Flies with the genotype FR/FR are crossed with flies of the fr/fr genotype.
2. The offspring from this cross are then crossed again with flies that are fr/fr.
**Results from the Cross:**
- Flies that can fly and have red eyes: 50
- Flies that cannot fly and have brown eyes: 45
- Flies that can fly and have brown eyes: 5
- Flies that cannot fly and have red eyes: 7
**Questions:**
(A) Which of the above offspring are recombinant?
(B) What is the map distance between the genes?
---
**Analysis:**
- **Parental Types**: Offspring showing the original phenotypes of the parents (fly with red eyes, non-fly with brown eyes).
- **Recombinant Types**: Offspring showing new combinations of traits (fly with brown eyes, non-fly with red eyes).
For question (A), identify the recombinant phenotypes based on observed new trait combinations.
For question (B), calculate the map distance using the formula:
\[ \text{Map distance (in centimorgans)} = \left( \frac{\text{Number of recombinant offspring}}{\text{Total number of offspring}} \right) \times 100 \]
Understanding these concepts is crucial for studying genetic linkage and chromosomal behavior.
Expert Solution
Cross of parents and F1 generation with recessive parent.
ANSWER1.
Recombinants: These are those offspring that have traits different from their parents. Here, Parent has FLY/RED eye and CANNOT FLY/BROWN eye trait while the recombinants have FLY/BROWN eye and CANNOT FLY/RED eye trait which came up as result of recombination.
Parental: Can fly/ red eye- 50, Cannot fly/ brown eye- 45
Recombinants: Can fly/ brown eye- 5, Cannot fly/red eye- 7
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