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Pani-rosa [81]
3 years ago
6

How did the combined effects of the emergence of cotton plantation production and the ban on external slave imports in the early

1800s effect the development of slavery in the U.S.
Biology
2 answers:
algol [13]3 years ago
8 0

Answer:

it helped the whites get clothes

Explanation:

they needed clothes or they would be naked

Svetllana [295]3 years ago
5 0
<h2> Slave Economy of Cotton Plantation </h2>

Explanation:

  • By 1850, of the 3.2 million oppressed individuals in the nation's fifteen slave states, 1.8 million were creating cotton. By 1850, of the 3.2 million oppressed individuals in the nation's fifteen slave states, For sure, American cotton before long made up 66% of the worldwide stockpile, and creation kept on taking off. 1.8 million were creating cotton
  • About 75% of the cotton created in the United States was in the end traded abroad. Despite the fact that the bigger American and Atlantic markets depended on southern cotton right now, South likewise relied upon these business sectors for acquiring nourishment, produced merchandise, and credits. Hence, the market transformation changed the South similarly as it had a different region

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Which of the following is/are true?
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Answer: Option A ,Band C.

Explanation:

Sympatric speciation is the evolution or isolation of new species from the original populations of species occupying in the same geographical area. Sympatric speciation commonly occur due to sexual selection of mates can cause reproductive barriers or isolation which keep gene pools separate. A plant with extra set of homologous chromosomes is an example of sympatric speciation.

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Which of the following is a function of the nervous system?
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7 0
3 years ago
The plasma membrane is mostly made of molecules that have hydrophilic heads and hydrophobic tails. these molecules are called __
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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
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