Crossing over etc - Genes are DNA DNA is packed in form of...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon
Genes are DNA DNA is packed in form of chromosomes Sex determination in humans is based on the presence of a Y chromosome 2 X chromosomes = female having a Y chromosome (XY) = male All the rest of chromosomes are called autosomes Sex-linked traits show inheritance patterns different than those of genes on autosomes.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
How do we know the location of genes? - Homologous chromosomes line up together in the profase of the 1st division…
Background image of page 2
…Possibly resulting in crossing over - physical exchange of regions between non-sister chromatids
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 genes on a pair of homologs, complete linkage: no exchange
Background image of page 4
2 genes on a pair of homologs, exchange occurs: recombinant gametes are produced
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
To study 2 linked genes you need to: 1. obtain a source of the crossover gametes - must be heterozygotic at all loci…
Background image of page 6
Most meiotic events will result in just “parental type “ gametes
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Some meiotic events will result in gametes that are “recombinant” type
Background image of page 8
Testcross gametes Offspring geno- types Offspring pheno- types ab AaBb AB ab Aabb Ab ab aaBb aB ab aabb ab …And the 2 nd thing you do is a test cross
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 10
Test cross
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 12
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/18/2008 for the course BIOL 1110 taught by Professor Kaverina during the Spring '08 term at East Tennessee State University.

Page1 / 25

Crossing over etc - Genes are DNA DNA is packed in form of...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online