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Law Incorporation [45]
3 years ago
7

Why are lethal dominant alleles so much more rare than lethal recessive alleles?

Biology
1 answer:
Lisa [10]3 years ago
4 0

The correct answer is: d. Lethal dominant alleles are harmful whether they are carried in homozygous or heterozygous form, so there is always strong selection against these alleles.

Lethal alleles cause the death (prenatal or after birth, but usually early in development) of the organism that carries them. There are three types of lethal alleles:  

• Recessive-both alleles must be defective,  

• Dominant-it is sufficient that one allele is lethal to cause the death,

• Conditional depending on the gene or genes involved.  

Lethal alleles are usually a result of mutations in genes essential for development of an organism.

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Sedimentary rocks that are formed partially by animals and plants are called what?
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3 years ago
Bio U06 USA FY21
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I'm thinking maybe B, illustrates the principle of natural selection.

Explanation:

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3 years ago
What is a way to prevent eutrophication?
Anon25 [30]

Answer:

Agricultural fertilizers are one of the main human causes of eutrophication. Fertilizers, used in farming to make soil more fertile, contain nitrogen and phosphorus. The use, or overuse, of fertilizers can cause these nutrients to runoff of the farmer's field and enter waterways. Eutrophication can have serious effects, like algal blooms that block light from getting into the water and harm the plants and animals that need it. If there's enough overgrowth of algae, it can prevent oxygen from getting into the water, making it hypoxic and creating a dead zone where no organisms can survive.

The following is a list of methods that can be used to control eutrophication:

planting vegetation along streambeds to slow erosion and absorb nutrients.

controlling application amount and timing of fertilizer.

controlling runoff from feedlots.

The best, easiest, and most efficient way to prevent eutrophication is by preventing excess nutrients from reaching water bodies. This can be done in a number of ways, the simplest of which is just being aware of the chemicals and fertilizers that we are using.

3 0
3 years ago
Can someone please answer this!
ololo11 [35]

Answer:

d.) All of the above

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Prophase is the first stage of mitosis. In this phase, the DNA condenses into chromosomes. The nuclear membrane breaks down, and the centrioles move to opposite sides of the cell.

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Next, during anaphase, the chromosomes are separated to either end of the cell

Finally, during telophase and cytokinesis, the nuclear membrane reforms and the chromosomes begin to decondense, and the cytoplasm splits to form two cells.

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3 years ago
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