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andre [41]
3 years ago
6

Most children with cystic fibrosis have frequent lung infections and digestive difficulties. Some people have mild cases, with o

nset of minor respiratory problems in adulthood. Some men with cystic fibrosis only exhibit the symptom of infertility. Which exception to Mendelian laws of inheritance best explains these symptoms?1.) incomplete dominance2.) pleiotropy3.) epistasis4.) codominance5.) overdominance
Biology
1 answer:
hram777 [196]3 years ago
3 0

Answer:

The correct answer is 4: "The exception to Mendelian laws of inheritance that best explains the mentioned symptoms is codominance".

Explanation:

In codominance, both alleles can be expressed. In these cases, heterozygote individuals<em> instead</em> of showing an <em>intermediate phenotype</em>, express both of the alleles. Their phenotype is an additive expression of their parents' genes.

In cystic fibrosis, there is a gene responsible for coding for a protein named "cystic fibrosis transmembrane conductance regulator, CFTR".

-Most of the people have two copies of the normal allele and produce the functional CFTR protein form.

-Patients with cystic fibrosis have two copies of the mutated allele and so produce the mutated and dysfunctional form for this protein.

-Heterozygote people possess only one normal CFTR allele and a mutated form for the same allele and produce a normal protein and a mutated protein.

In the last case, both alleles are codominant and they express in heterozygote individuals. Given the fact that the normal allele produces enough functional CFTR protein, these individuals do not have any adverse effect and the mutated allele is recessive at a physiological level.

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Which behavior can reduce pollution that occurs due to the use of coal?
mixas84 [53]

Answer:

A

Explanation:

Coal is majorly used to produces electricity. The coal is ignited and the heat produced used to heat water to steam. The steam is then used to drive turbines with a dynamo effect to produce electricity. Turning off lights when not in use reduces the demand for electricity hence reducing the amount of coal needed to meet this demand.

Other ways to conserve energy is using bulbs with low energy demand - such as LEDs - and  improving natural lighting indoors.

3 0
3 years ago
Which of the following statements about carotenoids is NOT true? Carotenoids include red, orange, and yellow pigments. Carotenoi
kvv77 [185]

       The right answer to this question is option D. Carotenoids are categorized into two major divisions: carotenes and beta carotenes

       First, let's check option A, it says that the carotenoids include red, orange and yellow pigments, that's true, we can check that on lab for example, a vegetable that can be mentioned here are carrots, it has lots of this and it's very healthy too, and remember, there isn't a single animal that can produce carotenoids, so they need to grab it from nature.

       The second option, B. says that sometimes carotenoids are sometimes called as acessory pigments, that's true too, some studies consider them acessory pigments, so, they're not alone there, there are different kinds of pigments that can be on that plant, and they're also very important for the animals. Option C refers to beta carotene as the most abundant carotene in plants, that's true too, we can also find other kinds of carotenoids on plants, but this one as it's seen in lab, is the most common one. The last one, D, isn't true, the two major divisions are: Xanthophylls and Carotenoids, beta carotenoids are a type of carotenoids, not a different group.

8 0
3 years ago
The level of which hormone increases after ovulation?
MArishka [77]

The answer should be C, progesterone.


Progesterone is the hormone which can help maintain the lining of uterus and to further thicken it so that the uterus is prepared for implantation and the development of a baby. The level of progesterone is significantly rose after ovulation.


On the other hand, LH, luteinising hormone, is produced by oestrogen, another female hormone which will drop after ovulation. LH helps stimulate ovulation and prevent the development of other follicles, the origin of eggs, to form yellow body instead. Which yellow body is the one which stimulates the production of progesterone.


Last but not least, I believe D should be testosterone, and it is a male hormone so it will not be found in female normally.


Therefore, your answer should be C, progesterone.

3 0
3 years ago
What was the main factor driving the migration of people?
vampirchik [111]
Multiple things cause the migration of people.

Economic issues arise:
People run out of jobs and opportunities
(BIGGEST REASON)

Cultural reasons:
Forced intentional migration had occurred in the past on accounts of slavery and political instability

Safety:
More popular reason now is because of war or fights with other countries, the people want to keep their family safe so they move them or move with them

Hope this helped
6 0
3 years ago
What 3 green house gases are in our atmosphere
Andreyy89

Answer:

Carbon dioxide, nitrous oxide, and methane

Explanation:

4 0
2 years ago
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