Posts Tagged ‘sex-linkage’

Theoretical genetics

Wednesday, April 20th, 2011

This is the fun stuff – working out genetics problems.  Before the fun stuff comes the groundwork – learning definitions.  Know the meaning of the following terms.

genotype, phenotype, dominant allele, recessive allele, codominant alleles, locus, homozygous, heterzygous, carrier, test cross, sex linkage

Here is Mr Taylor’s presentation on this section.  Use the links suggested for question practice.  The more problems you solve, the easier they become 🙂


Monday, October 11th, 2010

Genetics by Here's Kate on flickr

The system of inheritance is actually very logical.  We will learn what alleles are and how they combine to form an individual’s characteristics.  We will look at simple monohybrid crosses, involving things like eye colour, tongue-rolling and earlobes.  Then we will expand into multiple alleles and co-dominance (blood groups).  Next we’ll understand why equal numbers of boys and girls are born in the world and look at examples of sex-linked inheritance.  We will be simplifying the concepts – in reality many human characteristics are controlled by several genes on different chromosomes – so the real picture is more complex.  And we’ll finish up with a discussion of how much of our variation is down to our genes, and how much is due to environment.

There will be some new vocabulary to learn (Genetics terms), then lots and lots of problems to solve.  Try these ones for starters:  Genetics Questions and Simple Genetics problems

Here are some questions on co-dominance, multiple alleles and sex-linkage. Genetics Problems

This document contains a list of great websites with plenty more genetics practice. Online genetics problems