Question

Dr. Evil just discovered a way to prevent crossing over from occurring during meiosis in the gametes of her lab rats.

Answer 1

Crossing over occurs during meiotic divisions. It is a mechanism involved in genetic variation. Prophase I would be disrupted and there would be reduced genetic variation in the rats' offspring.

What is crossing-over?

Crossing over between homologous chromosomes together with the random lining of homologous chromosomes and random fertilization are mechanisms involved in genetic variation.

Crossing-over events occur during prophase 1 of the meiotic division.

It involves two homologous chromosomes interchanging chromosomal fragments, which make the daughter cells genetically different from the original one.

Crossing-over occurs randomly in different positions all along the chromosome, and its occurrence frequency in the area between two genes depends on the distance between them.

The Chiasma is the position where two homologous chromatids interchange genetic information, giving a place for new genetic material or information to be provided to descendants.

After crossing over, homologous chromosomes get separated again.

I could not find all the options. However, the chosen one seems to be correct.

Prophase I would be disrupted and there would be reduced genetic variation in the rats' offspring.

Let us analyze this option,

• Prophase I.. ⇒ Correct, since crossing-over events occur during the prophase of meiosis I

• ..reduced genetic variation... ⇒ Correct, since crossing-over is one of the mechanisms that lead to genetic variation. In its absence -disruption- there would be a noticeable reduction in variability.

The chosen option and its explanation are correct.

You can learn more about crossing over events at

brainly.com/question/19671756

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