Through the study of meteorites, their chemical composition of silicates—material made of silicon and oxygen. Others contain metal—nickel and iron. Knowing what the meteorite was composed of lets you know where it came from. Chondrites are composed of hardened lava - this is occurred at the beginning of the solar system (4.5 mya). Carbonaceous chondrites contain carbon and water which formed away from the sun.

Explanation:

4 0

3 years ago

Mitosis is responsible for growth, repair, and maintenance in an organism because A) it occurs at a faster rate than meiosis. B)

elixir [45]

Answer:

C) exact duplicates of each mother cell are produced.

Explanation:

4 0

4 years ago

If the a and b loci are 20 m.u. apart in humans and an A B/ a b woman mates with an a b/ a b man, what is the probability that t

Elanso [62]

Answer:

The probability of having a Ab/ab child is 10%

Explanation:

The genes A/a and B/b are linked and 20 m.u. apart.

The parental cross is:

Gametes:

The man only produces 1 type of gametes, so the probability of him producing an ab gamete is 1.

The woman produces 4: two parental (AB and ab) and two recombinant (Ab, aB).

Man: ab

Woman: AB, ab, Ab, aB

The formula to relate genetic distance with recombination frequency is:

Genetic Distance (m.u.)= Recombination Frequency X 100.

Replacing the data in the formula, we have:

20 m.u. / 100 = Recombination Frequency

0.2 = Recombination Frequency

Because the Recombination Frequency is 0.2, the woman will generate recombinant gametes 20% of times, and parental gametes the other 80%. Each recombinant gamete will appear in 10% of the cases, and each parental gamete will appear in 40% of the cases.

The probailities for each possible genotype of the progeny resulting from that cross will be:

Parental: AB/ab 40%

Parental: ab/ab 40%

Recombinant: Ab/ab 10%

Recombinant: aB/ab 10%

7 0

4 years ago

Plants use sunlight to produce some ATP during photosynthesis. How do plants produce ATP when the Sun is not out?

Alex17521 [72]

The correct answer is letter b. Plants also use cellular respiration. Plants use sunlight to produce some ATP during photosynthesis. When the sun is out, plants produce ATP for cellular respiration. Cellular respiration is a metabolic reaction that happens in cells of organisms that take energy from ATP.

7 0

3 years ago

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