Chapter 7

Question 1

Recombination

Answer 1

The sorting of alleles into new combinations. When one of the F1 progeny reproduces, the combination of alleles in its gametes may differ from the combinations in the gametes from its parents.

Question 2

Linked genes

Answer 2

Genes located close together on the same chromosome. Travel together in meiosis, end up in the same gamete, and do not assert independently.

Question 3

Linkage group

Answer 3

Genes located together on the same chromosome

Question 4

Nonrecombinant/parental gametes

Answer 4

Gametes that contain only original combinations of alleles present in the parents

Question 5

Nonrecombinant/parental progeny

Answer 5

Possesses the original combinations of traits possessed by the parents

Question 6

Recombinant gamete

Answer 6

Gametes with new combinations of alleles

Question 7

Recombinant progeny

Answer 7

The progeny with new combinations of traits formed from recombinant gametes

Question 8

Recombination frequency

Answer 8

The percentage of recombinant progeny produced in a cross.

Rf= (number of recombinant progeny/totally number of progeny) x 100

Question 9

Genetic map

Answer 9

Chromosome maps calculated by using the genetic phenomenon of recombination

Question 10

Physical map

Answer 10

Chromosome maps calculated by using physical distances along the chromosome. Often expressed as numbers of base pairs

Question 11

Map unit

Answer 11

Distances on genetic maps (m.u.)
1m.u. = 1% recombination
Aka cenitmorgans

Question 12

Centimorgans

Answer 12

Another name for map units

1cM = 1 Morgan

Question 13

Two-point testcross

Answer 13

A testcross between and individual heterozygous at two

Loci and an individual homozygous recessive at those loci.

Question 14

Three-point testcross

Answer 14

Cross between an individual heterozygous at three loci and an individual homozygous for recessive alleles at those loci