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wel
3 years ago
7

In humans, without considering the variation provided by crossing over, how much will two siblings from one set of parents vary

from each other?
Biology
2 answers:
Aleonysh [2.5K]3 years ago
8 0

Answer:

Siblings inherit essentially 50% of their genes from each parent, but two sibling offspring may share with each other from zero to 23 chromosomes in common from each parent and therefore very widely from each other.

Explanation:

It is not a surprise that when two brothers do a DNA test the results are very similar. However, it may be a surprise to many people that two brothers (not twins) with exactly the same parents and ancestors may have a different genetic makeup. After all, identical ancestors should give identical genetic compositions, right?

Well, it's not that simple. In fact, it is even common for siblings to have different genetic compositions. There are several factors that can affect genealogical ethnicities and result in different chromosomes for siblings of the same parents.

The siblings inherit essentially 50% of their genes from each parent, but two children can share from zero to 23 common chromosomes from each parent and thus very widely from each other.

Mars2501 [29]3 years ago
4 0

Answer:

Random segregation of homologous chromosomes makes the two siblings differ from each other for 0-23 chromosomes.

Explanation:

Sexual reproduction adds genetic variations in the progeny by crossing over, independent segregation of homologous chromosomes and random fusion of gametes. Without crossing over, independent segregation of homologous chromosomes towards opposite poles during anaphase I of meiosis may result in two siblings to vary from each other for 0-23 chromosomes.

There is an equal probability of each of the two siblings to get a chromosome from mother or father. Hence, irrespective of the variations provided by crossing over, random segregation of homologous chromosomes makes the two siblings differ from each other for 0-23 chromosomes.

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What is the major difference between bacterial chromosomes and eukaryotic chromosomes?.
Sphinxa [80]

The major difference between bacterial chromosomes and eukaryotic chromosomes is that bacteria have a single circular chromosome whereas eukaryotes have several linear chromosomes.

Eukaryotic chromosomes are present within the nucleus while prokaryotic chromosomes are found in the nucleoid (a region of the cytoplasm). The nucleoid does not have a membrane.

In eukaryotic chromosomes, DNA is wrapped around histone proteins, which is further compacted by supercoiling and folding. However, in prokaryotic chromosomes, DNA is supercoiled and held together by nucleoid-associated proteins.

Prokaryotic chromosome is very simple in comparison to the eukaryotic one. Prokaryotic chromosome lack telomeres and centromeres sequences which is found in the eukaryotic chromosomes.

To learn more about nucleoid here

brainly.com/question/14352975

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5 0
2 years ago
Growth hormone and insulin are protein hormones that regulate carbohydrate metabolism by hepatocytes (liver cells) through the a
aleksklad [387]

Answer:

The data from the experiment support the claim that the similar regulation of carbohydrate metabolism  by hepatocytes occurs when the cells are treated with growth hormone or insulin results from the activation of different signaling pathways

Explanation:

If we take a look on the graph, it shows increase in the phosphorylated protein when the growth hormone or insulin is applied to the cells with the passage of time. At  15 minutes , it reaches to its highest level but after 15 minutes of addition of growth hormone and insulin, the level of phosphorylated protein decrease when the time exceeds from 15 minutes to 240 minutes. So it is concluded that growth hormones or insulin increase the level of phosphorylated protein.

7 0
4 years ago
Explain why an mRNA transcribed from the template strand of the SIRT3 gene in normal stomach ( NS ) cells is translated to produ
Ivanshal [37]

Answer:

Explanation:

The double-stranded DNA molecule has the  potential to store genetic information in either strand, although in  most organisms <u>only one strand is used to encode any particular gene</u>.  

The template strand is the non-coding strand. The coding strand of DNA is the non-template (mRNA-like) strand (see attachment).

Thus, genetic  information is expressed by transcription of the non-coding (template) strand  of DNA, <u>which produces an mRNA molecule that has the same sequence  as the coding strand of DNA</u>. Therefore, if a mRNA is transcribed from the non-template strand, the genetic information will not be contained in that strand and it would not produce a correct protein.

6 0
3 years ago
Why is water necessary to your body
dusya [7]

Answer:

it's necessary because your body uses water in all its cells organs and tissue. water helps you to keep moving and functioning.

7 0
3 years ago
How are photosynthesis and cellular respiration different?
Ilia_Sergeevich [38]

Answer:

A

Explanation:

Photosynthesis produces carbon dioxide, while cellular respiration produces oxygen

5 0
3 years ago
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