Organisms with the genotypes AABbCcDd and AaBbCcDd are crossed. What are the expected proportions of the following progeny?

A–B–C–D–

Key Concepts

Genotype

A genotype refers to the genetic constitution of an organism, specifically the alleles it possesses for a particular gene. In the given question, the genotypes AABbCcDd and AaBbCcDd indicate the combinations of dominant and recessive alleles for four different genes. Understanding how these alleles interact is crucial for predicting the offspring's traits.

Punnett Square

A Punnett square is a diagram used to predict the genotypes of offspring from a genetic cross. It allows for the visualization of how alleles from each parent combine, helping to determine the probabilities of various genotypes and phenotypes in the progeny. This tool is essential for calculating the expected proportions of specific combinations, such as A–B–C–D–.

Independent Assortment

Independent assortment is a principle of genetics stating that alleles for different traits segregate independently of one another during gamete formation. This means that the inheritance of one trait does not affect the inheritance of another. In the context of the question, this principle is vital for understanding how the combinations of alleles from the two parent genotypes will result in various progeny genotypes.