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PIT_PIT [208]
3 years ago
10

The cell cycle includes four phases-- G1, S1, G2, and M. What occurs during the S phase?

Biology
2 answers:
LekaFEV [45]3 years ago
7 0

Answer:

In S phase, the cell synthesizes a complete copy of the DNA in its nucleus. It also duplicates a microtubule-organizing structure called the centrosome.

Explanation:

steposvetlana [31]3 years ago
6 0

Answer: B) cells increase in size and synthesize new proteins and organelles

Explanation:

Got it right on my test

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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
A pathogen that feeds off and causes harm to other organisms is called what?
FrozenT [24]
There are 5 main types of pathogens that can harm other organisms and cause diseases. They are viruses, bacteria, fungi, Protozoa, and worms.
4 0
3 years ago
Read 2 more answers
Which cell is most important for the defense against parasitic organisms ?
Murljashka [212]

I'd say, ina general way, that the most imporant cells in defense against parasitic organisms are definitely white blood cels, the cells responsible for defeating antigens, pathogens and deseases.

Although these might be the most important ones in that specific task (defending against parasitic organisms), all the cells in the immune system, along with other non-cell things are important, since they all play a specific role indispensable in our immune system.


Hope it helped,


BioTeacher101

8 0
3 years ago
gentoo penguins will present a mate with a pebble that they find to attract a mate. emperor penguins have a specific call and mo
vivado [14]
The answer is behavioral isolation.

Reproductional isolation is a way to prevent closely related species to mate each other. This is due to reproductive barriers which can be either prezygotic (before fertilization) and postzygotic (after fertilization) barrier. Behavioral isolation is an example of postzygotic barrier. It is based on behavior, including mating sounds and rituals. Thanks to behavior isolation, the different species (in this example gentoo penguins and emperor penguins) will have different mating rituals so they could attract only individuals of their own species, respectively.
5 0
3 years ago
Read 2 more answers
Expand the squared binomial. (x – 3)^2
stellarik [79]
(x-3)² = (x-3)(x-3)
= x² - 3x - 3x + 9
= x² - 6x + 9
4 0
3 years ago
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