Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
|
Who explained Mendel's work in terms of genes and chromosomes?
|
Thomas H. Morgan
|
|
|
Organism used by Thomas Morgan
|
fruit fly
|
|
|
Gene theory
|
-Chromosmes are in a row
- Traits which are inherited together are controlled by gene linkage - Crossing over can break groups - Position of genes on chrmosomes may be indicated on gene map |
|
|
Crossing over
|
breaking and exchange of linkage groups- increases variability of gametes and occurs during synapsis of meiosis
|
|
|
Somatic mutations
|
affect body cells- not passed to offspring
|
|
|
Germ mutations
|
-affect cells in gonads
-passed on to offspring |
|
|
More characteristics of mutations
|
-most are disadvantageous
-are random -most are recessive |
|
|
Polyploidy and nondisjunction
|
When a pair of chromosomes doesnt separate during meiosis (nondisjunction) a cell has an extra set of chromosomes (polyploidy)
|
|
|
Chromsoomal mutations
|
worse- badly affect offspring-additions and deletions of sections of chromosomes
|
