lecture 7- independent assortment, linkage, and gene mapping

Question 1

chi square test

Answer 1

• used to determine the P of observing a particular distribution under a specific hypothesis

Question 2

parental type

Answer 2

have same alleles as gametes that formed from F1 (B L and b l)

Question 3

recombinant type

Answer 3

have different combination of alleles from those in the gametes that formed in F1(B l and b L)

Question 4

crossing over

Answer 4

• breakage and rejoining of homologous DNA double helices
• visible in metaphase i as chiasmata
• occurs only between non-sister chromatids at the same place
• observed between linked loci on the same chromosome

Question 5

chiasma

Answer 5

events that happen when sister chromatids that are not together attach to the non-sister chromatids they are interacting with

Question 6

cis

Answer 6

recessive alleles on the same homologue (AB/ ab)

Question 7

trans

Answer 7

recessive alleles on different homologs (Ab/ aB)

Question 8

linked genes (cis dihybrid with crossing over)

Answer 8

in dihybrid meiosis, 50% recombinants (R) indicates that genes are on different chromosomes or far apart on the same chromosome

Question 9

linkage map

Answer 9

recombination frequency (RF)=
#of recombinant (CO) progeny x 100%/ total # progeny
RF = genetic distance
CO = crossing over