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4vir4ik [10]
3 years ago
15

Help please and thank you

Biology
2 answers:
Reil [10]3 years ago
7 0

Answer:

A crossing over introduces variety by producing different combinations of alleles

monitta3 years ago
5 0

Answer:

The First one is correct!! ♥️

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Evesa
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Active uptake (which I think you mean active transport) is important when the concentration gradient is against that of a certain substance, so it doesn't cross the membrane through diffusion or passive transport. It is sometimes necessary if a substance needs to move across a membrane but can't do so due to electrical charge or that there is a substance on the other side of the membrane preventing diffusion.

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Decrease

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Craig Venter’s group chose to create a synthetic life-form using a bacterium as their test subject. They inserted synthetic DNA
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The team would have to replace the nucleus.

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