Cross Phenotypes: 8 ivory eyes, maize body 9 wild eyes, wild type body = F2 You know that the male's genotype is X-Y ; visualize chromosomes: Note there are 2 traits that we m m are following. i+ We bred for females with the genotype X X÷; visualize chromosomes: m+ m m+ Determine the 2 sperm that the male will produce from meiosis. Crossing over does not occur in male Drosophila. Determine the 4 eggs that will result from meiosis. Two will form when crossing over does not occur between the wing and body color alleles, and two others when crossing over does occur somewhere between the two. 1. Since crossing over does not occur in males, all sperm will carry or Y.

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**Generation: F₁**
**Cross Phenotypes:** ♂ *ivory eyes, maize body* x ♀ *wild eyes, wild type body* = F₂

### Understanding the Genetic Cross:

You know that the male's genotype is \( X^{i/m} Y \); visualize chromosomes:
```
           i     m
         -------
```

We bred for females with the genotype \( X^{i+/m+} X^{i/m} \); visualize chromosomes:
```
            i+      i
           m+      m
           -------
```

*Note: There are 2 traits that we are following.*

### Explanation:

Determine the 2 sperm that the male will produce from meiosis. Crossing over does not occur in male *Drosophila*. Determine the 4 eggs that will result from meiosis. Two will form when crossing over **does not occur** between the wing and body color alleles, and two others when crossing over **does occur** somewhere between the two.

### 1. Male Sperm Production:
Since crossing over **does not occur** in males, all sperm will carry \( X^{i/m} \) or \( Y \).

### 2. Female Egg Production (No Crossing Over):
The eggs that will be produced if crossing over **does not occur** will carry:
- \( X^{i/m} \) 
- \( X^{i+/m+} \)

### 3. Female Egg Production (Crossing Over Occurs):
The eggs which will be produced if crossing over **does occur** will carry:
- \( X^{i+/m} \)
- \( X^{i/m+} \)

### Diagrams:

The image contains diagrams of the chromosomes:

- For the male: 
    - A paired chromosome with alleles: \( i \) and \( m \).
 
- For the female:
    - A pair of chromosomes with alleles: \( i+ \), \( m+ \), \( i \), and \( m \).

This educational resource explains the basics of genetic inheritance in *Drosophila* and visualizes the process of gamete formation considering both scenarios of crossing over and non-crossing over.
Transcribed Image Text:**Generation: F₁** **Cross Phenotypes:** ♂ *ivory eyes, maize body* x ♀ *wild eyes, wild type body* = F₂ ### Understanding the Genetic Cross: You know that the male's genotype is \( X^{i/m} Y \); visualize chromosomes: ``` i m ------- ``` We bred for females with the genotype \( X^{i+/m+} X^{i/m} \); visualize chromosomes: ``` i+ i m+ m ------- ``` *Note: There are 2 traits that we are following.* ### Explanation: Determine the 2 sperm that the male will produce from meiosis. Crossing over does not occur in male *Drosophila*. Determine the 4 eggs that will result from meiosis. Two will form when crossing over **does not occur** between the wing and body color alleles, and two others when crossing over **does occur** somewhere between the two. ### 1. Male Sperm Production: Since crossing over **does not occur** in males, all sperm will carry \( X^{i/m} \) or \( Y \). ### 2. Female Egg Production (No Crossing Over): The eggs that will be produced if crossing over **does not occur** will carry: - \( X^{i/m} \) - \( X^{i+/m+} \) ### 3. Female Egg Production (Crossing Over Occurs): The eggs which will be produced if crossing over **does occur** will carry: - \( X^{i+/m} \) - \( X^{i/m+} \) ### Diagrams: The image contains diagrams of the chromosomes: - For the male: - A paired chromosome with alleles: \( i \) and \( m \). - For the female: - A pair of chromosomes with alleles: \( i+ \), \( m+ \), \( i \), and \( m \). This educational resource explains the basics of genetic inheritance in *Drosophila* and visualizes the process of gamete formation considering both scenarios of crossing over and non-crossing over.
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