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ra1l [238]
3 years ago
10

A rock has been formed by the accumulation of bits of rocks that were originally formed by the release of heat by magma. How sho

uld this rock be classified?
Biology
1 answer:
vlabodo [156]3 years ago
3 0
The rock can be classified as Sedimentary. This is kind of a trick question. The main question is <em><u>a rock that has been formed by the accumulation of bits of rocks.</u></em><u /> That alone should give you a clue because sedimentary rocks are rocks that are made up of bits or particles of other rocks.

Now what about the part that says: <em><u>were originally formed by the release of heat by magma?</u></em>  <em />

At first glance you might think, then that means it is an igneous rock, but no it isn't. It was <em>originally</em> an igneous rock but the rock in question is the rock that was formed by BITS of it. So this means that the resulting rock is SEDIMENTARY. <em><u /></em>
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The blood Group of Mother is O. The Blood Group of the Child is B. Man Exonerated If He to Blood Group?​
aalyn [17]

Answer:

If the mother's blood type is O, and the child's blood type is B, a man would be exonerated from paternity if he has blood type A or O.

Explanation:

In the above case, if a mother has blood type O and her child has blood type B, a man can be exonerated from paternity only if his blood type is A or O, and responsible if he is type B or AB.

The blood type is defined by the presence of surface antigens in the red blood cell, called A and B. The presence of each antigen is determined by a gene present on the parental chromosomes.

  • <em> </em><u><em>Blood type A</em></u><em> corresponds to the presence of gene A, and its genotypic expression can be A/A or A/O. </em>
  • <u><em>Type B blood</em></u><em>, whose genotype is B/B or B/O, is due to the presence of a gene containing the B antigen. </em>
  • <u><em>AB blood</em></u><em> —due to codominance— has one gene for A and another for B, with genotype A/B. </em>
  • <em>Blood type O, characterised by the absence of surface antigens, behaves like a recessive trait, which only manifests itself in the absence of surface antigens A and B. The genotype is O/O. </em>

By making a hypothetical crossing between mother and man, one can observe why he can be exonerated.

<u>Man with blood type O </u>

♂ O|O

♀ O|O

Alleles     O      O

O           O|O   O|O

O           O|O   O|O

The only possibility, in this case, is to have children with type O blood. No chance of children B.

<u>Male with blood type A </u>

♂ A|O

♀ O|O

Alleles     A        O

O            A|O    O|O

O            A|O    O|O

In this case there is a 50% chance that the children will be blood type A and 50% chance that they will be O. No chance of children B.

In the case of a man A|A the result is 100% probability of children A|O, and no probability of children B.

<em>So, a </em><em>man with blood types A (any genotype) and O, can be exonerated from paternity</em><em>, since it is </em><em>impossible for him to have a child of blood type B, when the mother is of blood type O</em>.

4 0
2 years ago
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