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Snowcat [4.5K]
2 years ago
15

In facilitated diffusion, do molecules move down their concentration gradient?

Biology
1 answer:
Dominik [7]2 years ago
4 0
No, in facilitated diffusion molecules move against their concentration gradient. Facilitated diffusion is diffusion that requires an input on energy; moving against the concentration would require that energy.
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Suppose a population is carrying a condition controlled by two alleles: R (dominant) and r (recessive). Only homozygous individu
White raven [17]

<span><u>The answer is A. 72.25 percent.</u>

The Hardy-Weinberg principle can be used:</span>

<em>p² + 2pq + q² = 1</em> and <em>p + q = 1</em>

where <em>p</em> and <em>q</em> are the frequencies of the alleles, and <em>p²</em>, <em>q²</em> and <em>2pq </em>are the frequencies of the genotypes.

<span>The <em>r</em> allele (<em>q</em>) is found in 15% of the population:
q = 15% = 15/100
Thus, q = </span><span>0.15

To calculate the <em>R</em> allele frequency (<em>p</em>), the formula p + q = 1 is used:
If p + q = 1, then p = 1 - q
p = 1 - 0.15
Thus, </span><span>p = 0.85

Knowing the frequency of the <em>R</em> allele (<em>p</em>), it is easy to determine the frequency of the RR genotype (p²):
p² = 0.85² = 0.7225

Expressed in percentage, p² = 72.25%.</span>

4 0
2 years ago
Why does an ecosystem have carrying capacity
Romashka-Z-Leto [24]

Carrying capacity of an ecosystem is the defined as the largest population that it can sustain indefinitely with the available resources. Biologists also refer to carrying capacity as the “maximum load”. Carrying capacity has factors it depends on. These are the many abiotic and biotic factors in the ecosystem and some are more obvious than others.  The most obvious being, the availability of the basic needs of organisms which make up the different ecosystems. Some of these are food, water and shelter in which dictate how many individuals the ecosystem can sustain.

7 0
3 years ago
If a mother carries a recessive allele for a genetic disorder, such as cystic fibrosis, under what circumstances will her childr
Stels [109]

Answer: B) The mother's father must also carry the recessive allele

Explanation:

How Are Men Affected by Cystic Fibrosis? Males account for slightly more than 50 percent of all cases of cystic fibrosis (CF) but generally have better outcomes than females until about age 20.

8 0
2 years ago
Do pandas blink? If so why or why not?
In-s [12.5K]
Pandas only blink sometimes because they are looking out for danger most of the time. Like other mammals, they have an upper and lower eyelid, so yes they do blink, but not as much as humans.

8 0
3 years ago
Read 2 more answers
Pakicetus
Lisa [10]

Answer: The basic theme of whale evolution is the development of large animals from much smaller ancestors, and nowhere is this more evident than in the case of multi-ton sperm and gray whales, whose ultimate forebears were small, dog-sized prehistoric mammals that prowled the riverbeds of central Asia 50 million years ago. Perhaps more intriguingly, whales are also a case study in the gradual evolution of mammals from fully terrestrial to fully marine lifestyles, with corresponding adaptations (elongated bodies, webbed feet, blowholes, etc.) at various key intervals along the way.

Explanation:Pick B is the best choice

6 0
2 years ago
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