Linked Genes

If results of recombination do NOT follow Mendel's Law of Independent Assortment, genes are likely to be - - - 

• shuffled during meiosis

• linked

• inherited

• on separate chromosomes

Which genes are most likely linked?

• genes 1 & 2

• genes 2 & 3

• genes 3 & 4

• genes 1 & 4

Tags

NGSS.HS-LS3-1

If 40 offspring are recombinant and 260 are parental, how many centimorgan apart are the 2 genes?

• 15 cM

• 40 cM

• 260 cM

• 300 cM

If 50 offspring are recombinant out of total 100 offspring, how many centimorgans away from each other are the loci likely to be for 2 traits on one gene?

• 0.25

• 0.5

• 25

• 50

Tags

NGSS.HS-LS3-3

A __________ (abbreviated cM) is a unit of measure for the frequency of genetic recombination. One ___________is equal to a 1% chance that two markers on a chromosome will become separated from one another due to a recombination event during meiosis.

A centimorgan is a unit of measure for the frequency of genetic recombination. If two genes are __________ cM apart, then they are ___________ likely to be assorted apart during meiosis.

• 2, 20%

• 5, 0.5%

• 50, 50%

• 2, 3%

Tags

NGSS.HS-LS3-3

What are linked genes?

• Genes located on the same chromosome that tend to be inherited together

• Genes located on different chromosomes

• Genes that are always inherited independently

• Genes that do not undergo recombination

Which of the following best describes the concept of genetic linkage?

• Independent assortment of genes

• Genes on the same chromosome that are inherited together

• Random mutation of genes

• Crossing over of genes

If two genes are 10 centimorgans apart, what is the probability of recombination between them?

• 10%

• 50%

• 90%

• 0%

Tags

NGSS.HS-LS3-3

In a dihybrid cross, what would indicate that two genes are linked?

• The offspring show a 9:3:3:1 ratio

• The offspring show a 1:1:1:1 ratio

• The offspring show more parental phenotypes than recombinant phenotypes

• The offspring show only recombinant phenotypes