640Lecture0405

640Lecture0405 - Types of genetic markers Morphological...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Types of genetic markers Morphological variation – external morphology – viability / fertility CHROMOSOMAL CHROMOSOMAL POLYMORPHISMS chromosome variability –numbers – shapes • inversions • translocations Numbers Due to: – Robertsonian translocations – Supernumerary chromosomes – Many plants - Clarkia – Many insects - grasshoppers Robertsonian translocation
Background image of page 1

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

View Full DocumentRight Arrow Icon
grasshoppers viatica group White (1968) Polytene chromosomes from Drosophila melanogaster
Background image of page 2
INVERSION POLYMORPHISM chromosome variability – polytene chromosome variation in Drosophila • Salivary gland chromosomes in Drosophila and other dipterans (flies) – Inversion polymorphism in Drosophila pseudoobscura Inversions: (b) Pericentric (c) paracentric Inversions Suppress recombination – Lock alleles into “haplotypes” – “supergenes” can arise if loci which interact to affect a particular trait are locked into inversion
Background image of page 3

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

View Full DocumentRight Arrow Icon
Drosophila pseudoobscura FROM: Dobzhansky
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

640Lecture0405 - Types of genetic markers Morphological...

This preview shows document pages 1 - 5. Sign up to view the full document.

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