Humboldt State University ® Department of Chemistry

Richard A. Paselk

VUB Biology

Fall 2001

Lecture Notes:: 31 October

© R. Paselk 2001

Genetics, Chromosomes, & DNA


Many genes are linked, that is they don't assort independently as Mendel found.


Sex Chromosomes and Sex-linked Genes

Sex and Chromosomes: Different organisms determine sex in different ways:

Sex linked genes have a different pattern of inheritance.


Deviations in Chromosomal Inheritance

Genetic Disorders due to Alterations in Chromosome Number

Imprinting: Some genes vary in expression depending on whether they came form egg or sperm. Imprinting is erased for each new generation of gametes which are reimprinted. Seems to be due to methylation of DNA interferring with its expression.

Mitochondrial Inheritance: due to mitochondrial DNA, so maternal inheritance only.

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Last modified 31 October 2001
© R Paselk