Genetics Lecture 7, 9/12: Review for Test 1

This is the audio for today's lecture. Whenever there is a time in parenthesis it refers to the time in the recording that he discussed that particular subject. It is a review of what will be on the 1st test. My notes from the review are as follows:

- No X linked or pedigree problems!!
- 4th post. → Independent assortment is at the level of the gene. Different genes – hair color eye color. Assort to gametes independently
- 3rd post→ different alleles of the same gene. We all have 2 alleles for a gene and there is an equal chance of any gamete getting each allele. (11:45)
- prophase 1 (5 phases)


MENDELS POSTULATES
1. Genetic characteristics are controlled by unit factors (genes) which exist in pairs in individuals. Two copies of each gene one from mom and one from dad.
2. When you have different forms of the same unit factor (alleles) in an individual one of the traits dominates over the other. Referred to as the dominant trait. In Mendels experiments it appeared solely in the F1 generation and 3/4 in the F2 generation. Recessive trait which appears as 1/4 of the F2. (this is true for a lot of situations but it is not universally true.)
3. During gamete formation the unit factors (genes) segregate independent of each other. Roughly an equal likelihood of a gamete receiving a particular trait. Basically if an individually has both genes (an allele for tall and one for short) 50% of gametes will be tall and the other half will be dwarf.
4. during gamete formation segregating pairs of unit factors (genes) assort independently of each other. Law of independent assortment.