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GuDViN [60]
3 years ago
15

In order for this synthesis to occur, a series of steps are necessary and any disruption in this process can result in a deficie

ncy of vitamin D. With this in mind, choose the situations or conditions that could contribute to a vitamin D deficiency. Check all that apply Living in a region with a lot of sunlight Having a lighter skin pigmentation Having kidney disease wearing protective clothing and sunscreen when outdoors
Biology
1 answer:
Elodia [21]3 years ago
6 0

Answer:

Having kidney disease wearing protective clothing and sunscreen when outdoors

Explanation:

In principle, vitamin D deficiency is caused by reduced skin exposure to the sun, because this vitamin is synthesized with an enzyme precursor by the sun action. People who have kidney failure may also have this deficiency because its absorption is difficult for these patients.The skin of people who use excess sunscreen form less vitamin D.

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What is the name for the measure of a drug's relative safety for use, computed by the ratio of the lethal dose for 50 percent of
ira [324]
It is called THERAPEUTIC INDEX. Therapeutic index is the comparison of the amount of a particular drug that causes the desired therapeutic effects and the amount that causes toxicity. The index can be low or high. A drug with a low therapeutic index will require only a small increase in dose to produce toxic effects in users. 
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4 years ago
How does the structure of the bronchial tree change as the bronchi become smaller?
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7 0
3 years ago
Read 2 more answers
In a certain plant, tall stems (t) are dominant to short stems (t). a farmer crosses a short-stemmed plant with a heterozygous l
melisa1 [442]

The answers would be:

Genotype                Phenotype

     Tt                      Tall stemmed

     tt                       Short stemmed

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

<u />

<u>You can read on to see how this was done:</u>

Tall stems (T) are dominant to short stems (t).

First figure out the genotypes of the parents. We have a short-stemmed plant and a heterozygous long-stemmed plant cross.

For short stem to occur, you need 2 pairs of short alleles. So the first parent would have a genotype of tt.

Heterozygous long-stemmed means that the parent has one of each allele. So the genotype of the second parent would be, Tt.

Now we can make our Punnett Square.

tt x Tt

<u>       t        t  </u>

<u>T |  Tt  |   Tt</u>

<u>t  |   tt  |   tt</u>

Let's list down the genotypes and phenotypic results.

Genotype        no.         Phenotype

     Tt                 2           Tall stemmed

     tt                  2           Short stemmed

So from that we can answer the other questions:

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

8 0
4 years ago
What do bears do to survive the winter?
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3 years ago
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According to the law of supply, price and quantity move
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Explanation:

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