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
- Write the cross using correct symbols. What kind of cross is this called?
Transcribed Image Text:**2. In Fruit Flies:**
- At the b locus:
- \( + = \) normal color
- \( b = \) black body
- At the v locus:
- \( + = \) normal wing
- \( v = \) vestigial wing
A cross between a female fly heterozygous for both traits and a black-bodied male with vestigial wings is made.
a. Write the cross using correct symbols. What kind of cross is this called?
---
**Diagram Explanation:**
The diagram on the right shows the expected versus observed outcomes of genetic crosses in fruit flies. It consists of two columns:
- **Expected:**
- Shows one fly with normal color and normal wings.
- Shows one fly with black body and normal wings.
- Shows one fly with normal color and vestigial wings.
- Shows one fly with black body and vestigial wings.
- **Observed:**
- Shows one fly with normal color and normal wings.
- Shows five flies with black body and normal wings.
- Shows one fly with normal color and vestigial wings.
- Shows five flies with black body and vestigial wings.
This visual aid helps illustrate the deviation between predicted genetic outcomes and actual results observed in genetic experiments.
Expert Solution
Step 1
The alleles are the alternative forms of a gene that are located on the same locus of a homologous chromosome with contrasting characteristics.
In case of diploid (2n) organisms a particular gene has two alleles, one is dominant and another is recessive in nature.
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