Gene Mapping and Gene Linkage

Given the crossover frequency of each of the following genes, construct a chromosome map.  

Gene    Frequency of Crossover

A-C            30%

B-C            45%

B-D            40%

A-D            25%

• A - B - C - D

• B - D - A - C

• B - A - D - C

• C - A - D - B

The recombination frequency between gene F and gene G is 10.4%, the recombination frequency between gene F and gene H  is 8.0%, and the recombination frequency between gene G and gene H is 18.4%. Which is the correct arrangement of these genes?  

• FGH

• FHG

• GFH

• HFG

Tags

NGSS.HS-LS3-3

1 map unit is equal to:

• 1 nm

• 1 chromosome

• 1 mutation

• 1% recombination

The following are results of crossing a female fly (AaBb) with a male fly (aabb). 

AaBb 1005

aabb  1000

Aabb  200

aaBb  210

Which two genotypes are the recombinant offspring? 

• AaBb & Aabb

• AaBb & aaBb

• Aabb & aaBb

• AaBb & aabb 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

According to _______, genes that are closer together on a chromosome, have a higher chance of being inherited together.  

• Gene Linkage

• Polygenic

• Pleiotropy

• Epistasis

What is genetic recombination?

• The combination of genes produced by crossing over and independent assortment.

• A map that shows the sequence of genes on a chromosome.

• When genes located close to each other on the same chromosome tend to travel together during meiosis.

• The occurrence of one or more extra sets of chromosomes.

Tags

NGSS.HS-LS3-2

What is Hybridization?

• breeding an organism with a known genotype with an unknown genotype and using the offspring to determine the unknown.

• Breeding organisms to create hybrids.

• Breeding 2 closely related organisms.

• A process of selecting desired traits to be passed on to offspring.

What is polyploidy?

• The combination of genes produced by crossing over and independent assortment.

• A map that shows the sequence of genes on a chromosome.

• When genes located close to each other on the same chromosome tend to travel together during meiosis.

• The occurrence of one or more extra sets of chromosomes.

What is a Test Cross?

• breeding an organism with a known genotype with an unknown genotype and using the offspring to determine the unknown.

• Breeding organisms to create hybrids.

• Breeding 2 closely related organisms.

• A process of selecting desired traits to be passed on to offspring.

Tags

NGSS.HS-LS3-1

Why is genetic recombination a good thing?

• Gives us new genes

• increases genetic variation

• is lethal in humans

• separates during crossing over

Tags

NGSS.HS-LS3-2