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Darina [25.2K]
2 years ago
15

Occasionally a child is born with an extra chromosome 13, but never do you see a child with an extra chromosome 12, why?

Biology
1 answer:
Morgarella [4.7K]2 years ago
3 0

This is because some of the trisomies (one extra chromosome, three instead of two) are fatal, births cannot survive.

Theoretically, trisomies can occur with any chromosome, but often result in miscarriage.

The types of autosomal trisomy that survive to birth in humans are:

Trisomy 8 or Warkany syndrome 2

Trisomy 9

Trisomy 13 or Patau syndrome

Trisomy 18 or Edwards syndrom

Trisomy 21 or Down syndrome.


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krok68 [10]

Answer:

C) Interaction increases the survival and reproductive rates of mutualistic species.

Explanation:

A) Mutualism offer more biodiversity to a community.

    Biodiversity is the different species living in one environment. Since mutualism is only involving two species, it wouldn't increase the biodiversity of one ecosystem, making it incorrect.

B) Individuals partaking in a mutualistic relationship relationship are more resistant to parasites.

    Mutualism is only benefiting two species, not their immunity to diseases and parasites. These two have no correlation with each other, making it incorrect.

D) Mutualistic interaction lessens competition in communities where it is present.

    Since mutualism is only benefiting two species, they have no correlation since the relationship doesn't affect the different species in the environment.

E) Mutualistic relationships allow organisms to synthesize and use energy more efficiently.

    Although there could be some relationships involving energy transfer between the species, that would sound more like commensalism or even paratsitism if you think about it. However, it is very uncommon and usually energy has no relationship with species relationships, making it incorrect.

Hope this helps! My deepest apologies if I got in incorrect!

5 0
3 years ago
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Calculate the volume of 1 M NaOH needed to prepare 12.0 mL of a 0.10-M solution. Prepare this solution. (Refer to the Dilutions
Lapatulllka [165]

Answer:

1.2 mL

Explanation:

<em>This is a problem of simple dilution. The dilution principle simply agrees that the number of moles before dilution must be equal to the number of moles after dilution.</em>

Recall that: number of moles = mass/molar mass or molarity x volume.

Hence, for the dilution principle:

              initial molarity x initial volume = final molarity x final volume.

In this case, initial molarity of NaOH = 1 M, initial volume = ?, final molarity = 0.1 M, final volume = 12.0 mL.

Initial volume = final molarity x final volume/initial molarity

                       = 0.1 x 12/1 = 1.2 mL

It thus means that 1.2 mL of 1 M NaOH would be taken and then diluted up to 12.0 mL mark by the addition of distilled water in order to produce 12.0 mL, 0.10 M NaOH solution.

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THE ASNWER IS Photosynthesis.

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