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dimulka [17.4K]
3 years ago
10

The four major divisions on the geologic scale

Biology
1 answer:
KatRina [158]3 years ago
5 0
Eons: Hadean, Archean, Proterozoic
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Consider a disease allele that is both dominant and lethal to patients that possess it. how could such an allele be passed on fr
Dmitry_Shevchenko [17]
Through parents having intercourse, so the genes are passed on to generation to generation,
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3 years ago
A zoology student is investigating whether it is true that the gender of turtles depends on the temperature at which the turtle
Aleonysh [2.5K]
The temperature is the independent variable. The independent variable is the variable that the researcher can control. And the dependent variable will change because of the change of independent variable. In this question, the student controls the temperature(independent variable) to see wether the gender(dependent variable) will change due to the temperature.
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3 years ago
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Explain mutations and how they can cause genetic disease
nadya68 [22]
Answer:

A mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals
called mutagens, or infection by viruses. Germ line mutations occur in the eggs and sperm and can be passed on to offspring, while somatic mutations occur in body cells and are not passed on.

Mutation has been the source of many Hollywood movies, but it's really a simple process of a mistake made in a DNA sequence as it's being copied. Some of that's just the background noise that DNA copying is not perfect, and we should be glad of that or evolution couldn't operate. But mutation can also be induced by things like radiation or carcinogens in a way that can increase the risk of cancers or birth defects. But it's pretty simple; it's basically an induced misspelling of the DNA sequence.
That's a mutation.


When a variant alters a protein that plays a critical role in the body, it can disrupt normal development or cause a health condition. A condition caused by variants in one or more genes is called a genetic disorder. In some cases, gene variants are so severe that they prevent an embryo from surviving until birth.

5 0
3 years ago
explain why a father with blood group AB cannot donate for a child with blood group O when he marries a woman with blood group O
denis-greek [22]

The odds are astronomical for a father with AB(IV) to have an O(I) child. The only possible way for this phenomenon to occur is if there was a nondisjunction in the ovogenesis for the 9th chromosome and the father also had a nondisjunction for the same chromosome(A sperm cell with no 9th chromosome fertilized an ovum with two 9 chromosomes).

A person with AB cannot donate to a person with O because the receiver has antibodies(alpha and beta) that bind to the antigens on the AB blood cells, causing death.

7 0
3 years ago
Which RNA nucleotide is complementary to adenine?
Yakvenalex [24]

Answer:

It would be uracil

Explanation:

RNA base pairs:

A - U

G - C

5 0
3 years ago
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