Ch. 7 Slides (Exam 2) - Linkage and Chromosome Mapping in Eukaryotes

Question 1

Sutton and Boveri united fields of ____ and ____.

Answer 1

Cytology; Genetics

Question 2

Sutton (1903) - many more “____ ____” than chromosomes.

Answer 2

Unit factors

Question 3

Linked genes (____)
- Certain genes ____ as if somehow joined or linked together.
- Genes may be part of the same ____ - transmitted as a ____ ____.
- Linked genes not free to undergo ____ ____.

Answer 3

Linkage
- Segregate
- Chromosome; Single unit
- Independent assortment

Question 4

Synapsed homologous pairs reciprocally exchange ____ ____.
- ____ ____ event.
- Results in reshuffling (____) of alleles between homologs.

Answer 4

Chromosome segments
- Crossing over
- Recombination

Question 5

The ____ of crossing over is proportional to distance between any two ____ on a single ____.

Answer 5

Frequency; Loci; Chromosome

Question 6

Genes show ____ is on the same chromosome.

Answer 6

Linkage

Question 7

Independent assortment: ____ pairs of chromosomes each with ____ gene pair.
- No ____ exhibited.
- ____ genetically different ____ produce with different combinations of alleles of the two genes.

Answer 7

Two; Heterozygous
- Linkage
- Four; Gametes

Question 8

Linkage without crossing over: ____ genes linked on the ____ chromosome.
- ____ crossing over occurs.
- Only ____ genetically different gamete(s) is/are produced.
- Complete ____ produces ____ or ____ gametes in equal proportions.

Answer 8

Same; Same
- No
- Two
- Linkage; Parental; Noncrossover

Question 9

Linkage with crossing over: crossing over between two ____ genes:
- Involves two ____ chromatids.
- Generates two new ____ combinations called ____ or ____ gametes.

Answer 9

Linked
- Nonsister
- Allele; Recombinant; Crossover