Biology Lecture 6: Eukaryotic Recombination
Clicker Question: Which type of bacterial genetic exchange involves donor cells that are dead?
D. Both A and B
E. Both B and C
Recombination enzymes “cut” and “paste” both DNA backbones.
Two recombination events would have to take place in order for the B+ allele to end up on the
Transposons can send a copy of themselves on a plasmid.
Transposons can replicate and recombine and send a copy to another target sequence.
Plasmids can carry resistance genes to recipient cells.
Clicker Question: My son Jay has a unique combination of alleles as a result of “cutting and pasting” DNA
backbones. When did this recombination occur?
A. When Jay was a newly fertilized, single celled zygote.
B. When Jay was a developing fetus.
C. When Jay reached sexual maturity.
D. When Jay’s parents made gametes.
Zygotes bring DNA from two parents into close proximity.
Homologus chromosomes carry the same genes, but different alleles.
In prophase of meiosis I, homologues pair and recombine.
Recombination happens in prophase of meiosis I.
“Crossing Over” is