To answer the given questions, we need to understand the concepts of dihybrid individuals and genetic ratios.
### Part 1: Identifying the Dihybrid Individual
A dihybrid individual is heterozygous for two pairs of alleles. This means the individual possesses two different alleles for each of two traits. In our given genotypes, we need to identify which one fits this criterion.
- bbee: This individual is homozygous recessive (bb) for the first gene and homozygous recessive (ee) for the second gene. Not a dihybrid.
- BBee: This individual is homozygous dominant (BB) for the first gene and homozygous recessive (ee) for the second gene. Not a dihybrid.
- BbEe: This individual is heterozygous (Bb) for the first gene and heterozygous (Ee) for the second gene. This is a dihybrid individual.
- bbEE: This individual is homozygous recessive (bb) for the first gene and homozygous dominant (EE) for the second gene. Not a dihybrid.
Therefore, the genotype BbEe represents a dihybrid individual.
### Part 2: Identifying Ratios Indicative of Linkage
In genetics, independent assortment typically leads to a 9:3:3:1 phenotypic ratio in the offspring of a dihybrid cross. When genes are linked, they do not assort independently, and the observed phenotypic ratios will deviate from this expected 9:3:3:1 pattern.
Now, let's check the given ratios to determine which ones indicate linkage and not independent assortment:
- 8800: This is simply a numeric value and does not represent a Mendelian ratio. It's symbolic and does not follow the 9:3:3:1 ratio. This could indicate linkage as it deviates from the standard pattern.
- 9:3:3:1: This is the classic ratio indicating independent assortment of two genes. It does not suggest linkage.
- 12:2:2:1: This ratio deviates from the expected 9:3:3:1 and suggests that the genes may be linked or other factors are influencing the assortment.
Thus, the ratios that indicate linkage are:
- 8800
- 12:2:2:1
### Summary
1. The genotype representing a dihybrid individual is BbEe.
2. The ratios that indicate linkage are 8800 and 12:2:2:1.
