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Aleks [24]
3 years ago
10

Fill in the blanks---

Biology
1 answer:
mr Goodwill [35]3 years ago
3 0
A chromosome contains one long DNA molecule.

Each gene in this DNA molecule gives the instructions for making a protein.

Both chromosomes in a pair of homologous chromosomes have the same genes, but the genes in these 2 homologous chromosomes may have different alleles.

Alleles are basically different versions of the given gene.
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The most closely related are amphibians and reptiles.

The least related are amphibians and mammals

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Amphibians broke off from reptiles, birds, and mammals around 260 millions years ago and next up are the reptiles which broke off around 225 million years ago. So they are the most closely related


Mammals are the last to break off, around 200 million years ago. So they are the least related to amphibians.


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