NS 1300 Emergence of Modern Science

Patterns of Inheritance

How will the results of Human Genome Project change our

lives forever?

Chromosomes

Mendel’s Laws• Law of Segregation

- homologous - chromosomes

- gene pairs

- alleles

- homozygous- heterozygous

- gene loci

- gene frequency

Inheritance of a Single Trait• Genotype

• Phenotype

• Gamete Formation (meiosis)

Monohybrid Crosses

Dihybrid Crosses

Incomplete Dominance

Polygenic Inheritance

Multiple Alleles

Sex-Linked Inheritance

Chromosomal Mutations

Nondisjunction

Viruses• DNA Viruses

• RNA Viruses

• Retroviruses

• Adenoviruses

Quiz• 1. T or F, genes are found on chromosomes.

• 2. T or F, homologous chromosomes are segregated independently during meisosis.

• 3. T or F, sex-linked traits are determined by genes on the Y chromosome.

• 4. T or F, non-disjunction can produce birth defects.

• 5. Use this monohybrid cross to answer the following question:Where A represents aggression and aa lack of aggression. If A is completely dominant over a, what are the odds of having aggressive offspring from this cross?

A a X Aa