LINKAGE AND RECOMBINATION

Who coined the term linkage

• Correns
• Mendel
• Morgan
• DeVries

Mendel did not observe linkage due to

• mutation
• crossing over
• synapsis
• independent assortment

Crossing over occurs during

• Pachytene
• Diplotene
• Diakinesis
• metaphase

crossing over in doplotene organisms is responsible for

• dominance of gene
• segregation of alles
• recombination of linked genes
• linkage between genes

Linked genes are

• located on different chromosomes of the same size and shape
• located on the same chromosome
• rarely inherited together

Crossing-over of parts of chromosomes:

• has no effect on genetic linkage
• usually decreases the number of genetic combinations in a population
• can increase the number of genetic combinations in a population

Tags

NGSS.HS-LS3-2

Linked genes are

• re located near each other on the same chromosome.
• violate the law of independent assortment.
• segregate together during meiosis.
• All of the above.
• None of the above

How did Morgan demonstrate crossing over?

• A fly that received only y+w+m+ and ywm chromosomes from her parents was able to transmit different combinations of alleles to her offspring.
• A fly with a gray body and red eyes (wild type) was able to produce offspring with gray bodies and white eyes.
• True breeding yellow, white, miniature flies always had yellow, white, miniature offspring.
• None of these examples demonstrate crossing over.

Tags

NGSS.HS-LS3-2

 What was the result of breeding a white-eye fly and a red-eye fly?

• All of the offspring had white eyes.
• All of the offspring had red eyes.
• All of the offspring were male.
• all females are red eyed while all males are white eyed

Tags

NGSS.HS-LS3-2

NGSS.HS-LS3-1

What theory was proven to be accurate by the fact that there were more white-eyed flies in the second generation than the first?

• The theory that species evolved through natural selection
• The theory that traits could be dominant or recessive
• The theory that chromosomes did not carry genetic information
• The theory that flies prefer to have white eyes

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4