L5 linkage and mapping

Question 1

what is one big sign that some genes are linked?
which type of chromosomes are parental, recombinant or nonrecombinant

Answer 1

the overrepresented phenotypes in a generation are the same as the original parents.

nonrecombinant

Question 2

if there is an absence of linkage, what is the frequency of recombination? what about tight linkage?

Answer 2

50%, expectation under independent assortment for absence.
close to 0% because there are no recombinants

Question 3

what causes recombination?

Answer 3

a physical exchange between paired homologous chromosomes early in prophase of the first meiotic division after chromosomes have duplicated, this exchange involves only two of the four chromatids in a meiotic tetrad.

crossovers are called chiasmata

Question 4

are markers that are further apart on the chromosomes more or less likely to recombine?

Answer 4

more likely, bc crossing is more likely to occur.
* can’t cross what you can’t reach?*

Question 5

what is most important to find when doing gene order problems?

Answer 5

which gene is in the middle (one that is different in the rarest cases)