Linkages Worksheet

Question 1

during meiosis, a pair of synapsed chromosomes is made up of four chromatids called

Answer 1

tetrad

Question 2

the phenomenon of a crossover occurs when homologous chromatids in the tetrad(one from each of two parents) exchange segments of varying length during ___

Answer 2

prophase

Question 3

the point of crossover is known as ___

Answer 3

chiasma

Question 4

typically has at least one chiasma along its length

Answer 4

tetrad

Question 5

generally the longer the chromosome the ___ number of chiasma

Answer 5

greater

Question 6

two theory of phyiscal nature of proess

Answer 6

classical theory
chiasma type theory

Question 7

proposes that cross over and formation of chiasma occur first, followed by breakage and reunion with reciprocal homologues

Answer 7

classical theory

Question 8

chiasma formation need not be accompanied by chromosome breakage

Answer 8

classical theory

Question 9

breakage occurs first, and broken strands then reunite. Chiasmata are thus evidence, not causes, of crossovers

Answer 9

chiasma type theory

Question 10

if the interference is ___ this means that the frequency of double crossovers is expected and that a crossover in one region occurs independently of a crossover in an independent region

Answer 10

zero

Question 11

if the interference is __, that no double crossovers are observed because a crossover in one region completely blocks a crossover in an adjacent region

Answer 11

1