Molecular Genetics Exam 4

Question 1

Chromosome linkage is based on

Answer 1

linkage

Question 2

The position of a gene on a chromosome is known as a

Answer 2

loci

Question 3

The loci can be determined based on its

Answer 3

distance and ability to recombine with other genes

Question 4

Genes assort independently if they are on different

Answer 4

chromosomes

Question 5

Independent assortment

Answer 5

non homologous chromosomes orient independently at metaphase 1 of meiosis

Question 6

when genes are on the same chromosome, genes are linked because of __ not the ___

Answer 6

chromosome, gene

Question 7

what is the unit of transmission during meiosis for gene linkage?

Answer 7

chromosomes

Question 8

Crossing over results in

Answer 8

recombinants

Question 9

parental are the products that look like the

Answer 9

parents

Question 10

Crossing over occurs during

Answer 10

prophase 1 of meiosis

Question 11

crossing over is an __ exchange of __ material

Answer 11

equal, genetic

Question 12

synapsed chromosomes in meiosis wrap around each other to create

Answer 12

chiasmata

Question 13

chiasmata are

Answer 13

x shaped intersection points of genetic exchange

Question 14

if crossing over occurs between 2 linked genes, both __ and __ gametes are produced

Answer 14

parental (non recombinant) abd recombinant (crossover)

Question 15

Gene distance is called

Answer 15

map units

Question 16

map units are equal to the

Answer 16

percent recombination which suggests how far apart genes are on the chromosome

Question 17

Despite how far away genes are, they will never get more than

Answer 17

50% recombination

Question 18

The further away the recombination, the __ of recombination

Answer 18

greater chance

Question 19

How to create map units

Answer 19

(total number of recombinants/total number of progeny)*100

Question 20

The lowest numbers for progeny represent

Answer 20

recombinants

Question 21

if 2 crossovers take place between marker genes, and both involve the same pair of chromatids, then neither crossover is detected because

Answer 21

all of the resulting chromosomes are nonrecombinant

Question 22

DNA markers

Answer 22

short segments of DNA whose sequence and location are known

Represent landmarks along the chromosome

Question 23

Single nucleotide polymorphism is a

Answer 23

molecular marker that can determine cancer

Question 24

Restriction fragment length polymorphisms(RFLPs)

Answer 24

polymorphic sights that are specific DNA sequences that are recognized and cut by restriction enzymes