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poizon [28]
3 years ago
12

Index fossils allow geologists to _____.

Biology
1 answer:
rewona [7]3 years ago
5 0
Useful for dating and cossetting the strata of which the fossil is found in
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Describe each step required to make a gene knock-out in mice.
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Answer:

1. Designing of the target vector.

2. Insertion of the target vector into the embryonic stem cell

3. Selection of the cells

4. Injecting selected cells into the new cells

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Explanation:

The target vectors are made by inserting markers into them. The target vector is inserted into ES cells. The vector generally recombined with the target gene and knock-out that gene. Sometimes, recombination of vectors occurs at incorrect place.

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The developed mouse will consist of heterozygous knockout cells and its own cells. The normal mouse is bred with this chimeric mouse. The offspring of these mouse are able to transfer knock-out gene to next generation.

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