Genetic Linkage & mapping in eukaryotes 4 Flashcards
Synteny
Two or more genes are located on the same chromosoome (physically linked)
Genetic linkage
Genes that are close to each other tend to transmitt together as linked genes
Genes on the same chromosome that are close to each other are ________________
Physically linked (Can’t independently assort)
When genes on the same chromosome are _____________ then independent assortment can happen
Far apart
In an 9:3:3:1 ratio how many offsprings will have the parental phenotype?
10 ( 9 will have the dominant trait & 1 will have the recessive trait)
In ______________ the domiant trait will show the most in a data and then the recessive trait will be the second most to show in a data
Linked genes
In _______________ genes the dominant trait will show the most in a dat & the recessive trait will show the least (9 domiant, 1 recessive) (9:3:3:1)
Independent assorted
If linked genes are ___________ independent assortment will occur but the rate of independent assortment will depend on the distance apart
Far Apart
Independent assortment of linked genes leads to crossing over which results in ________________
Recombinant geneotypes & offsprings
Crossing over occurs in ___________ where the homologous sister chromatids pairs up & each one switch a fragment with each other
Prophase 1 in meiosis 1
Recombinants
Combinations of genotypes that are different from the parents
Why doesn’t crossing over occur within sister chromatids?
Because sister chromatids are identical to each other therefore won’t have any genetic diversity
The likelihood of crossing over between two genes depends on the ________________
Distance between them
If two genes are __________ the crossing over will occur
Far apart
If two genes are _________ then crossing over wont happen
Close together