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AlexFokin [52]
3 years ago
15

________ is the condition that occurs when there is a lack of muscle coordination during voluntary movement. A. quadriplegia B.

ataxia C. dorsiflexion D. myocele
Biology
1 answer:
Sonbull [250]3 years ago
5 0

Answer:

B. Ataxia

Explanation:

Ataxia is a medical condition that is characterized by impaired balance or coordination as a result of a damage to the cerebellum or nerves and muscles that control coordination and voluntary movements. Alcohol intoxication, certain medications, stroke, cerebral palsy, degeneration of the brain, are some of the causes of ataxia. Individuals suffering from ataxia might exhibit signs like unsteady gait, difficulty with speech, lack of eye coordination, etc.

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The order from what I remember is
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Cytokinesis- also known as daughter cells
7 0
3 years ago
Consider a species of sparrow that originally lived only in Alaska but recently expanded its range through North America, then C
Shtirlitz [24]

Answer:

North America is the one with the highest heterozygosity frequency for most loci, followed by Central America, and finally, South America with the lowest heterozygosity level.  

Explanation:

Some different forces or mechanisms might alter H-W equilibrium and lead to evolution, such as mutation, natural selection, migration, and genetic drift.

In the exposed example, we have a species of sparrow that migrates from Alaska to North America. Migration is unidirectional, which means that the movement occurs in only one direction: from Alaska to North America. We should also consider that the first immigrants colonized the area for the first time, meaning that there was not a receiving population of the same species already established. Finally, we need to consider that Alaska´s environmental conditions are very different from North America´s environmental conditions.

When a species arrives at a new place, it needs to adapt. The establishment and dispersion of the species in the new area depend on previous adaptation. So, when the firsts sparrow individuals arrived in North America, they faced new environmental conditions that acted as selective pressures that drove to the occurrence of mutations. A mutation implicates a stable and inheritable change in the genetic material. A mutation introduces changes, new alleles in the population, variability. But mutation rates are very low and have no evolutive direction, so they need another force to increase or decrease the mutant allelic frequencies. Natural selection benefits new advantageous alleles and transmits them to new generations changing their relative frequencies. <em>So, sparrows arrive in North America, mutated, and natural selection favored the beneficial mutations leading to a better adaptation to the environment.</em> This means that the heterozygosity level in this new recent population is very high.

As animals adapt to the new habitat and have better dispersal genes, they get to disperse even more. So they start new migration south, to Central America and South America. Again, they are moving to new regions with new conditions, and to establish they need to suffer new adaptations. But remember that we are talking about a recent event in time. Probably the animals migrating south are just a few.  They have not spent enough time yet in the new area, to adapt to the new environment and to include new genes into their population. What is even more, as they are a small new population moving south, they are more vulnerable to genetic drift events. Genetic drift acts on a population decreasing the variability between individuals, hence, decreasing the heterozygosity. <em>This small population suffers low mutation, has not enough time to establish, and is more vulnerable to genetic drift events.</em> The heterozygosity level is probably inferior to North America´s one.

Comparing the three areas, we could say that North America is the one with the highest heterozygosity frequency, followed by Central America, and finally, South America with the lowest level of heterozygosity.

8 0
2 years ago
5.Each chemical element is made up of only one kind of *
krek1111 [17]
Each element is made of only one kind of atom
5 0
3 years ago
Human red blood cells that lack sufficient hemoglobin would have a low amount of what substance?
lisabon 2012 [21]

If a human’s red blood cells will lack sufficient amount of hemoglobin, he or she would have also a low amount of oxygen.

Hemoglobin is what makes the red blood cells red in color, aside from the abnormal color, the red blood cells also make up of oxygen.  It can also be with iron since iron is bind to hemoglobin all the way to the lungs.

6 0
3 years ago
Which condition is NOT a requirement of the Hardy-Weinberg equilibrium?
Bumek [7]
D; Hardy- Weinberg requires a very large population size so that genetic drift can be insignificant.
6 0
3 years ago
Read 2 more answers
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