Linkage (Leaving Cert Biology): Flashcards
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Definition of linkage
Definition of linkage
Two genes located on the same chromosome
Where are linked genes located?
Where are linked genes located?
On the same chromosome
Why are linked genes inherited together?
Why are linked genes inherited together?
They do not separate during meiosis
How do linked genes behave during cell division?
How do linked genes behave during cell division?
Remain together and pass into gametes as a unit
Ratio: non-linked heterozygous dihybrid x hom. recessive
Ratio: non-linked heterozygous dihybrid x hom. recessive
1:1:1:1
Ratio: non-linked het. dihybrid x het. dihybrid
Ratio: non-linked het. dihybrid x het. dihybrid
9:3:3:1
Ratio for linked genes
Ratio for linked genes
1:1 or 3:1
Mendel's law violated by linked genes
Mendel's law violated by linked genes
Law of Independent Assortment
Mendel's Second Law (Independent Assortment)
Mendel's Second Law (Independent Assortment)
Either member of a pair of factors is equally likely to recombine with either of another pair
Gametes from TtPp when T linked to P
Gametes from TtPp when T linked to P
TP or tp only
Effect of linked genes on offspring variation
Effect of linked genes on offspring variation
Reduces variation