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rodikova [14]
3 years ago
7

In many animals, height is an example of a polygenic trait. Which types of natural selection can affect polygenic traits? I. dir

ectional selection II. disruptive selection III. stabilizing selection
Biology
1 answer:
Marat540 [252]3 years ago
7 0

The question is incomplete as it does not have the options which are:

I. only

I. and II. only

II. and III. only

I, II, and III.

Answer:

I, II, and III.

Explanation:

The mechanism of natural selection can be explained for the trait which is determined by one gene but the traits which can be determined by more than one gene like height (polygenic trait), the selection becomes very complex.

The natural selection can be explained by the phenotype produced in a population and that depends on the genes.  The polygenic trait shows the variation in the population, therefore, it is impossible to predict only one mechanism and therefore all types of natural selection occurs on a population.

Thus,  I, II, and III are correct.

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Most neurodegenerative diseases involve inability to remove misfolded/aggregated proteins. The cellular organelle that often fai
klasskru [66]

Answer: c. proteasome

Explanation:

Proteasomes are extremely important multi-catalytic proteases and are involved in various cellular functions. The proteasome is an essential component of eukaryotic cells and is responsible for the ATP-dependent proteolytic degradation of most cellular proteins. They are present in the nucleus and cytosol and can represent up to 1% of total cell proteins. Proteasomes generally degrade proteins to small peptides, most of which are rapidly hydrolyzed by cytoplasmic exopeptidases. It catalyzes the rapid degradation of many enzymes, regulatory proteins, and eliminates abnormal proteins resulting from mutation or damaged proteins. The inability of this cellular organelle can lead to neurodegenerative diseases, such as Parkinson´s disease.

8 0
3 years ago
The vitamin that plays a role in maintaining epithelia and is required for the synthesis of visual pigments is vitamin
Korolek [52]

The vitamin that plays an important roles in the epithelia and in the synthesis of visual pigments is vitamin A.

Vitamin A (retinol) is needed for the synthesis of photopigments. The photopigment rhodopsin is synthesized withinside the rods and is answerable for imaginative and prescient beneathneath low ranges of light. When nutritional reassets of diet A are insufficient for a protracted length of time, the quantity of visible pigment withinside the photoreceptors declines.

Vitamin A (VitA) is a micronutrient this is important for preserving imaginative and prescient, selling boom and development, and defensive epithelium and mucus integrity withinside the body.Vitamin A is critical for lots physiological processes, which includes preserving the integrity and feature of all floor tissues (epithelia): for example, the skin, the liner of the respiration tract, the gut, the bladder, the internal ear and the eye.

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7 0
11 months ago
Do antimicrobials affect bacteria or do bacteria affect antimicrobials?
Blababa [14]

Answer:Antibiotics disrupt essential processes or structures in the bacterial cell. This either kills the bacterium or slows down bacterial growth. Depending on these effects an antibiotic is said to be bactericidal or bacteriostatic.

6 0
2 years ago
Anyone help please lord please
Scilla [17]

Answer:

Explanation:

Gram positive stains are purple; gram negative are pink; cocci bacteria are spherical; the other is rod. There you go!

3 0
2 years ago
Two pure-breeding lines of orange trees differ in the number of fruit segments they contain: One line produces fruit with 6 segm
lys-0071 [83]

Answer:

from the image:

1. eight

2. four

3. less than

Explanation:

from the data given...

n= 4

where n= # of genes

&, the extreme # of segments=   (\frac{1}{4} )^{n}

Genes, which make up a genotype are instructions for encoding a phenotype, expressed as proteins in translation.

...one gene may have 2 alleles

An allele is an alternate form of a particular gene. Genes can have multiple alleles, but in this case...

∴4 genes= 4 × 2=<u> </u><u>8 segments</u>

<u />

<u>Thus, each allele gives </u> \frac{8}{8} = <u>1 segment</u>

<u></u>

<u></u>

5 0
3 years ago
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