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FrozenT [24]
3 years ago
6

What does it mean when a biologist uses the term crossing-over? why is crossing over a good thing?

Biology
1 answer:
igor_vitrenko [27]3 years ago
8 0
It refers to dna and chromosomes
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In this experiment, how many chromosomes were present when meiosis i started? 2. in this experiment, how many nuclei are present
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1. The answer depends on your picture.
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Since the process of division is going to start that means each chromosome will have an X shape. They had the DNA content copied once (in the S phase). The original, plus the copy created, form the X.

You just have to count the number of X's in the picture.

2. The answer is 4 nuclei.
Since the process of division happening is meiosis, that means that four new cells will be originated from a cell that's dividing.
So, four new cells each one with a nucleus, that means 4 nuclei in total.

If this was mitosis, only 2 new cells would be formed which means 2 nuclei

3. The number of chromosomes depends on your picture/exercise.

The answer would be half of the number of chromosomes that you started in the meiosis 1.
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O D. ozone depletion.

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