1. The Earth experiences days and nights due to the:

Biology

1 answer:

Flura [38]3 years ago

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C. Rotation on its axis

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The mining of phosphate and erosion of the coast

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Which one of the following statements MOST accurately describes methylation? Methyl groups are most often added to cytosines adj

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The most true answer from these choices is:

Methyl groups most often added to guanine-cytosine base pairs because they are held by three hydrogen bonds, and this decreases the probability of gene expression.

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A man with normal vision marries a color-blind woman. Red-green color blindness is an X- linked recessive disorder. They have a

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Answer: The probability is 100%.

Explanation: The chromosome X is related to gender. A man carries two different chromosomes (XY) and a woman carries two similar chromosomes (XX). The offspring of a couple will inherited:

If it is a boy, he inherites the chromosome Y from his father and X from his mother;
If it a girl, she inherites X from her father and X from her mother;

In the question, the woman is color-blind, which means she carries the recessive alleles: $X^{d}X^{d}$

The man, on the other hand, is normal, so his X-linked genotype will be: $X^{D}Y$ .

Now, since they have a daughter, she inherited her double X from each of her parents, which means she inherited one $X^{d}$ from her mother and one $X^{D}$ from her father.

So, the daughter's genotype can only be heterozygotic $X^{D}$ $X^{d}$ in other words, the probability is 100%.

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