MathBench > Probability

Linked Genes and Recombination
Advanced Punnett

Here's Smiley

In this module, we're going to lose the mice and go with a universally recognized icon, the smiley face. Our face will have two phenotypic characteristics: eyes and teeth.

To make it easy to remember, the "normal" characteristics will be the dominants and the variants will be the recessives:

normal eyes
allele: E

normal eyes

bug eyes
allele: e

bug eyes
and

normal teeth
allele: T

normal teeth

rabbit teeth
allele: t

rabbit teeth

When I show the eyes and mouth inside a face, that means you're seeing the entire phenotype --

On the other hand, when I show just the eyes and mouth (no face), it means we're just looking at the genotype of a gamete -- i.e., either the mother's or the father's contribution to a baby smiley. For example, an EeTT mother could have 2 kinds of eggs:

Click below to see all the possible phenotypes and gametes:

Phenotypes: Genotypes: