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Sholpan [36]
3 years ago
15

Why might the risk of infectious disease be high in a community that has no water treatment facility?

Biology
1 answer:
max2010maxim [7]3 years ago
4 0
Since the water isn't being purified, the water is extremely dirty due to all of the trash, urine, etc. This causes infectious diseases to be higher in those type of communities
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In humans, a type of blindness is due to a dominant allele; normal vision is the result of a recessive allele. Migraine headache
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Answer:

Yes.

Probability of such child = 1/2 or 50%

Explanation:

According to the question, below are the genotypes and phenotypes possibilities:

aa = normal vision & no headache

Aa = normal vision & no headache

AA = blindness & headache

                                                                      Male                       Female

                                                                        Aa                            aa

Possible genotypes of progeny:            Aa        Aa           aa         aa

So it is clear that out of the 4 probable children, 2 with 'genotype aa' will have normal vision & no headache.

Mathematical expression is as under:

2/4 = 1/2 that means 50% progeny.

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