working type beetie that normally smooth, large and you discover 3 mutations that lead to the recessive phenotypes bumpy, small and grey, respectively. You cross true-breeding smooth white beetles to true-breeding bumpy grey beetles and get all smooth white F1 beetles. Then, your cross the F1 beetles to true- breeding bumpy grey beetles and, after analyzing 800 F2s, calculate a map distance of 5 cM between the smoothness and color loci. a. What are the 4 phenotypic classes you get in the F2? Fill in the table below. For the body type (i.e., smooth or bumpy), use S or s to designate the alleles. For the color (ie., white or grey), use W or w to designate the alleles. For the size (i.e., large or small), use L or l to designate the alleles. Genotypic class Phenotypic class Number of this phenotype 380 380 20

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### Educational Exercise: Genetics of Beetle Phenotypes

#### Problem Statement

When studying beetles that are typically smooth, large, and white, three mutations have been identified causing recessive phenotypes: bumpy, small, and grey. In this genetic exercise, the goal is to understand the inheritance pattern by crossing different beetle strains.

#### Genetic Crosses and Phenotypic Classes

**Initial Crosses:**

1. **Cross 1:** 
   - **Parents:** True-breeding smooth white beetles and true-breeding bumpy grey beetles.
   - **Result:** All smooth white F1 beetles.

2. **Cross 2:** 
   - **Cross of F1:** F1 beetles to true-breeding bumpy grey beetles.
   - **Mapped Distance:** A calculated map distance of 5 cM between the smoothness and color loci was determined using the F2 phenotype.

**F2 Generation Phenotypes:**

- **Analysis of 800 F2 beetles** provides the following genotype and phenotype data:

| Genotypic Class | Phenotypic Class  | Number of this Phenotype |
|-----------------|-------------------|--------------------------|
|                 | White, Smooth, Large  | 380                      |
|                 | White, Smooth, Small  | 380                      |
|                 | Grey, Bumpy, Large    | 20                       |
|                 | Grey, Bumpy, Small    | 20                       |

**Genotypic and Phenotypic Symbols:**

- **Body Type (Smooth/Bumpy):** Use 'S' or 's'
- **Color (White/Grey):** Use 'W' or 'w'
- **Size (Large/Small):** Use 'L' or 'l'

#### Part B: Cross Analysis

**Goal:**

- Discover the genotypes and phenotypes of two parental beetles (P generation) that yield F1 beetles exhibiting large and smooth traits.

**Procedure:**

1. **Cross F1 with True-breeding Small, Bumpy Beetles:**
   - **Results:** 
     - 228 large and smooth
     - 19 small and smooth
     - 16 large and bumpy
     - 237 small and bumpy

2. **Construct a Table:**

| Phenotype        | Number Observed |
|------------------|-----------------|
| Large, Smooth    | 228
Transcribed Image Text:### Educational Exercise: Genetics of Beetle Phenotypes #### Problem Statement When studying beetles that are typically smooth, large, and white, three mutations have been identified causing recessive phenotypes: bumpy, small, and grey. In this genetic exercise, the goal is to understand the inheritance pattern by crossing different beetle strains. #### Genetic Crosses and Phenotypic Classes **Initial Crosses:** 1. **Cross 1:** - **Parents:** True-breeding smooth white beetles and true-breeding bumpy grey beetles. - **Result:** All smooth white F1 beetles. 2. **Cross 2:** - **Cross of F1:** F1 beetles to true-breeding bumpy grey beetles. - **Mapped Distance:** A calculated map distance of 5 cM between the smoothness and color loci was determined using the F2 phenotype. **F2 Generation Phenotypes:** - **Analysis of 800 F2 beetles** provides the following genotype and phenotype data: | Genotypic Class | Phenotypic Class | Number of this Phenotype | |-----------------|-------------------|--------------------------| | | White, Smooth, Large | 380 | | | White, Smooth, Small | 380 | | | Grey, Bumpy, Large | 20 | | | Grey, Bumpy, Small | 20 | **Genotypic and Phenotypic Symbols:** - **Body Type (Smooth/Bumpy):** Use 'S' or 's' - **Color (White/Grey):** Use 'W' or 'w' - **Size (Large/Small):** Use 'L' or 'l' #### Part B: Cross Analysis **Goal:** - Discover the genotypes and phenotypes of two parental beetles (P generation) that yield F1 beetles exhibiting large and smooth traits. **Procedure:** 1. **Cross F1 with True-breeding Small, Bumpy Beetles:** - **Results:** - 228 large and smooth - 19 small and smooth - 16 large and bumpy - 237 small and bumpy 2. **Construct a Table:** | Phenotype | Number Observed | |------------------|-----------------| | Large, Smooth | 228
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