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Anarel [89]
3 years ago
8

What is meant by Koch's postulates ?

Biology
1 answer:
nydimaria [60]3 years ago
3 0

Answer: four criteria to establish a causative relationship between a microbe and a diseases

Explanation:

1- "Bacteria must be present in every case of diseases"

2- "Bacteria must be isolated from the host with the diseases and grown in pure culture"

3- "The specific diseases must be reproduced when a pure culture of bacteria is inoculated into a healthy susceptible host"

4-"Bacteria must be recovered from the experimentally infected host"

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How many different offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits when
aalyn [17]

Answer:

27 genotypes and 8 phenotypes

Explanation:

Supposing that the genotypes of both of the parents are AaBbDd (A, B and D are dominant over a, b and d).  After completing the Punnett square, you can predict the following offspring:

I add an image where you can see all the 27 genotypes and frequencies.

Finally, all the 8 phenotypes with the following frequencies:

27/64 A-B-D-

9/64   A-B-dd

9/64   A-bbD-

9/64   aaB-D-

3/64   A-bbdd

3/64   aaB-dd

3/64   aabbD-

<u>1/64    aabbdd </u>

Total 64/64

Note: when a phenotype is A-, it means that it came from either genotype, AA or Aa. The same applies to B- (BB or Bb) and D- (DD or Dd)

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3 years ago
Which of the following people is most likely to develop varicose veins?
konstantin123 [22]

Answer:

An overweight, elderly woman who spends most of the day sitting. is correct

Explanation:

4 0
2 years ago
Which best summarizes the process of protein synthesis? a.RNA instructs DNA to make proteins. b.DNA unzips, resulting in the for
lakkis [162]
C. RNA moves the DNA code to the ribosomes
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Extra points for answers
Tpy6a [65]
The magma melts then hardens for a long time then iron magnesium pretty much sugar coats it and crystallizes it.

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How do plants get the nitrogen they need to grow?
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A

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