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Degger [83]
3 years ago
6

Scientists have noted a decline in the number of all mushroom species dating back to the early 1900s. In addition, annual crops

of edible mushrooms in France and Germany have declined since 1950. One hypothesis explaining the decline is that edible fungi are being overharvested. Global warming and air pollution have also been considered as part of the problem. What evidence helps to exclude overharvesting as the cause of the overall decline? A) a similar decline in edible North American mushrooms B) absence of mushrooms near coal-burning powerplants in Indonesia C) increase in mushroom species in a region of tropical South America D) declines in poisonous, non-edible mushroom species in cool climates
Biology
1 answer:
zalisa [80]3 years ago
8 0

The correct answer should be D.) Declines in poisonous, non-edible mushroom species in cool climates. Although question B does provide evidence that Global warming could be the cause of the declines, it still doesn't disprove the theory that overharvesting could be the cause as well. Question C could be caused by a number of things, such as deforestation, a local change in climate, removal of agricultural pests, ect. Question A supports the hypothesis that overharvesting is the cause of the decline, instead of disproving it. Hope this helped!

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the couple is also concerned about their child inheriting hemophilia, another rare disease, which is x-linked. natalie’s brother
IgorC [24]

Hemophilia is a recessive X-linked condition and is inherited from parents. . The probability that Natalie and Daniel’s first child has hemophilia is<u> 1/4</u>, not 1/8. The statement is<u> false.</u>

<h3>What is an X-linked gene?</h3>

When talking about sex-linked genes, we refer to all those genes located in one of the sex-chromosomes and not in the somatic ones.

X-linked genes are the genes located specifically in the X sex chromosome.

Traits coded by these genes are inherited. This is, X-linked genes are transmitted from parents to children through generations.

According to this, X-linked genetic disorders will be inherited as well.

  • Men have a high probability of being affected since they only have one copy of the X chromosome.
  • In women, the effect of the mutation might be musk in heterozygous state if the mutation is recessive.

Hemophilia is a recessive X-linked disorder, which means it is coded by the recessive allele.

  • X+ ⇒ X chrosomosome with Dominant allele
  • X- ⇒ X chrosomosome with Recessive allele

<u>Genotype              Phenotype</u>

X+X+                   Healthy woman

X+X-                    Healthy carrier woman

X-X-                     Hemophilic woman

X+Y                      Healthy man

X-Y                       Hemophilic man

Let us make a pedigree of these families,

<u>Natalie's family</u>:

Mother         healthy carrier          X+X-

Father          healthy                      X+Y

Brother        hemophilic                X-Y  

Natalie         Healthy                     X+X- or X+X+  

Natalie has 1/2 chances of being carrier X+X- and 1/2 of being X+X+.

<u>Daniel's family</u>:

Mother         healthy carrier          X+X-

Father          hemophilic                X-Y  

Sister           hemophilic                X-X-

Daniel          Healthy                      X+Y

He has 1/2 chances of being healthy X+Y and 1/2 of being affected X-Y.

According to the product probability rule, if events A and B are independent from each other, the probability of occurrence of both events together is

P(A∩B) = P(A) x P(B)

In this case,

  • event A is Daniel being affected ⇒ 1/2
  • event B is Natalie being carrier ⇒ 1/2

P(A∩B) = P(A) x P(B) = 1/2 x 1/2 = 1/4

The probability that Natalie and Daniel’s first child has hemophilia is 1/4, not 1/8. The statement is<u> false.</u>

You can learn more about X-linked genes at

brainly.com/question/12420228

brainly.com/question/14704182

brainly.com/question/1387724

#SPJ1

7 0
1 year ago
What is the most common toad of Central America.
kipiarov [429]
Hello!

I believe the answer is the Gulf Coast toad.

Hope this helps! ☺♥
5 0
3 years ago
Cells placed in an isotonic solution would
serg [7]

The amount of stuff inside the cell and outside the cell are equal

6 0
3 years ago
Please help, I’ll give brainliest :)
seropon [69]

Answer:

a,b and c

Explanation:

( it might be wrong pls dont report me just let me kno y its wrong )

7 0
3 years ago
The chemical structure of a carbohydrate contains repeating units of molecules composed of carbon, hydrogen, and oxygen atoms. W
pochemuha

Answer:

D. sugars

Explanation:

monosaccharides disaccharides polysaccharides blah blah blah sugar made from photosynthesis sugar is carbohydrate blah blah blah

6 0
2 years ago
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