Chapter 5- Linkage, Recombination, and the mapping of genes

Question 1

recombination

Answer 1

formation of new genetic combinations by exchange of parts between homologs

Question 2

linkage

Answer 2

when two loci recombine in less than 50% of gametes

Question 3

chiasma

Answer 3

structure formed at the spot where crossing over occurs between homologs

Question 4

tetratype

Answer 4

an ascus (sexual spore bearing cell in fungi) containing spores of four different genotypes

Question 5

locus

Answer 5

the relative chromosomal location of a gene

Question 6

coefficient of coincidence

Answer 6

the ratio of observed double crossovers to expected double crossovers

Question 7

interference

Answer 7

one crossover along a chromosome makes a second nearby crossover less likely

Question 8

parental ditype

Answer 8

an ascus containing only two nonrecombinant kinds of spores

Question 9

first division segregation

Answer 9

when the 2 alleles of a gene are segregated into different cells at the first meiotic division

Question 10

mosaic

Answer 10

individual composed of cells with different genotypes