Biology 205 Chromosomal Basis of Inheritance: Sex linkage and Determination

Chapter 3

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1. State the chromosomal theory of inheritance and define basic concepts

2. Explain the X and Y chromosome system for sex determination in humans

3. Sex linkage

4. Nondisjunction of sex chromosomes

Define non disjunction.

Learn basic syndromes in humans related to non disjunction.

6.Sex Determination

Mammals: Sex determined mainly by the Y chromosome

Explain the concept of dosage compensation p 61-63

Other Chromosomal Systems


Genic systems - mating strains + Vs - mating strains as in yeast, other fungi and many protists

Environmental sex determination

Some fish and reptiles. Turtles - eggs above 32C become female, eggs below 28C become male