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Transcript 

Homologous
 Chromosomes made up
by the same
genes
sister
Chromatids
from mother
 Contain different forms
of the same genes
▪ Therefore, not identical
similar gene

Tetrad
 Two homologous chromosomes attached
together
 4 chromatids

Synapsis
 When two homologous
chromosomes attach
together
 Occurs during prophase 1
 Form tetrad



Occurs during synapsis of prophase 1
Non-sister chromatids entangle and twist
around each other
Genes exchanged
homologous
chromosome
pair
As the chromosomes
move closer together,
synapsis occurs.
Chromatids break,
and genetic information
is exchanged.

Creates variation in resulting gametes

New combinations of alleles in gametes

But why?
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