Linked Genes & Recombination Flashcards
Genes located near each other on the same chromosome tend to be inherited together & are called:
Linked Genes
T/F Linked genes assort together without crossing over.
TRUE
Morgan tested linked genes and found that they:
Appeared to be inherited together, because they were near eachother on same chromosome.
However, Morgan also found that:
Both combinations of traits not seen in P generation were also produced.
Therefore, there had to have been some:
Genetic Recombination
If the offspring were all parent types, and assorted 1:1:0:0 then we can conclude:
Yes, genes were linked.
Recombinants are:
Offspring with different genetic combinations than the parental types.
When end portions of two nonsister chromatids trade places?
Crossing Over
If genes were simply independently assorted?
Offspring equal
If there were no crossovers, & genes linked?
No recombinants
If there were crossover?
More parental types
Crossover events occur in what processes?
Meiosis I & II
Can crossing over happen in males?
No - between X&X chromosomes
Where in Meiosis would crossover events occur?
Cannot predict when but during Prophase I.
Whats so good about crossing over anyways?
Leads to new combinations of alleles and greater variation in the species! Greater variation for Natural Selection!
