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atroni [7]
3 years ago
6

After the aswan high dam was built on the nile river, the rate of parasitic worm infection doubled in the human population near

the dam. as a result of building the dam, the flow of the nile changed. this changed the habitat, which resulted in an increase in its population of a certain aquatic snail. the snails, which were infected, released larvae of the worm. these larvae then infected humans. this situation best illustrates that:
Biology
2 answers:
Ivan3 years ago
6 0
The influence of humans on a natural system can have unpredictable negative impacts
valentinak56 [21]3 years ago
4 0

After the aswan high dam was built on the nile river, the rate of parasitic worm infection doubled in the human population near the dam. as a result of building the dam, the flow of the nile changed. this changed the habitat, which resulted in an increase in its population of a certain aquatic snail. the snails, which were infected, released larvae of the worm. these larvae then infected humans. this situation best illustrates that:

A. the influence of humans on a natural system is always negative in the long term

B. the influence of humans on a natural system can have unpredictable negative impacts

C. human alteration of an ecosystem does not need to be studied to avoid ecological disaster

D. human alteration of an ecosystem will cause pollution and loss of finite resources.

The correct answer is option (B) the influence of humans on a natural system can have unpredictable negative impacts.

The biosphere refers to the biologically inhabited part of the earth in association with the atmosphere, hydrosphere and the lithosphere. Human beings have been influenciung this natural system of biosphere causing numerous negative impacts. This finally affects all the living organisms of the biosphere.

Human activities like industrialization, construction of dams, chemicals based agriculture and others have been affecting the habitats. Construction of the dams changes the habitat. This change in the habitat can endanger or increase certain species. The change in the habitat can affect the abiotic factors as well as the biotic factors. In case of the river Nile, it increased the snails which were infected by the larvae of parasitic worms. Thus, doubling the infection of parasitic worms in the humans.

When the natural system of rivers have been influenced by the humans, it always has the negative effects on the life.

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Genetic crossings example<br>​
valentinak56 [21]

Answer:

Answer:Monohybrid Cross

Answer:Monohybrid CrossIn a monohybrid cross, the parent organisms differ in a single characteristic. Suppose, for example, two humans have children. The father has a widow's peak and the mother does not. A widow's peak is a dominant trait, meaning that if the child inherits the gene for this trait from one parent, that child will have a widow's peak regardless of the gene inherited from the other parent.

Answer:Monohybrid CrossIn a monohybrid cross, the parent organisms differ in a single characteristic. Suppose, for example, two humans have children. The father has a widow's peak and the mother does not. A widow's peak is a dominant trait, meaning that if the child inherits the gene for this trait from one parent, that child will have a widow's peak regardless of the gene inherited from the other parent.Consequently, there are two possibilities. The child could inherit the widow's peak gene from his father, or he could inherit the non-widow's peak gene from his father. He will inherit a non-widow's peak gene from its mother, who does not have the widow's peak gene. In this particular monohybrid cross, there is a fifty-fifty chance that any given child will have a widow's peak.

Answer:Monohybrid CrossIn a monohybrid cross, the parent organisms differ in a single characteristic. Suppose, for example, two humans have children. The father has a widow's peak and the mother does not. A widow's peak is a dominant trait, meaning that if the child inherits the gene for this trait from one parent, that child will have a widow's peak regardless of the gene inherited from the other parent.Consequently, there are two possibilities. The child could inherit the widow's peak gene from his father, or he could inherit the non-widow's peak gene from his father. He will inherit a non-widow's peak gene from its mother, who does not have the widow's peak gene. In this particular monohybrid cross, there is a fifty-fifty chance that any given child will have a widow's peak.Dihybrid Cross

Answer:Monohybrid CrossIn a monohybrid cross, the parent organisms differ in a single characteristic. Suppose, for example, two humans have children. The father has a widow's peak and the mother does not. A widow's peak is a dominant trait, meaning that if the child inherits the gene for this trait from one parent, that child will have a widow's peak regardless of the gene inherited from the other parent.Consequently, there are two possibilities. The child could inherit the widow's peak gene from his father, or he could inherit the non-widow's peak gene from his father. He will inherit a non-widow's peak gene from its mother, who does not have the widow's peak gene. In this particular monohybrid cross, there is a fifty-fifty chance that any given child will have a widow's peak.Dihybrid CrossIn a dihybrid cross, the parents differ in two characteristics you want to study. The pattern of inheritance here is somewhat more complicated. Suppose, for example, that you have two parents, one of whom has dimples and a widow's peak while the other has no dimples and no widow's peak. Dimples, like a widow's peak, are a dominant trait. Consequently, if these two traits are not linked, each child has a 1/4 probability of inheriting dimples and widow's peak, a 1/4 probability of inheriting dimples but no widow's peak, a 1/4 probability of inheriting a widow's peak but no dimples, and a 1/4 probability of inheriting neither. Keep in mind, however, that linked traits might exhibit very different patterns.

6 0
3 years ago
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klemol [59]
Chloroplasts main function is photosynthesis
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4 years ago
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Agata [3.3K]

Answer:

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3 years ago
The agent of microevolutionary change that is most likely to introduce genetic variation from another population is referred to
Genrish500 [490]

Answer;

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