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vladimir1956 [14]
3 years ago
11

Do all cells have the same DNA? Explain, please.

Biology
2 answers:
Artemon [7]3 years ago
8 0
Nearly every cell in a person's body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).
miv72 [106K]3 years ago
6 0
DNA is our genetic material, and if every cell in this world has the same exact DNA, we would be the exact same (unless something like nondisjunction occurs)
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4 0
3 years ago
A couple plans to have a child. the mother is homozygous for an autosomal recessive mutation. the father is heterozygous for the
adoni [48]

<u>Answer</u>:

  • The possible genotypes of the children are Hh and hh.
  • The probability of genotype Hh = 1/2
  • The probability of genotype hh = 1/2

<u>Explanation</u>:

  • <em>Autosomal genes</em> are the genes present on any of the chromosomes except the sex chromosomes.
  • An autosomal recessive mutation is the mutation in an autosomal gene which only expresses itself in the phenotype in homozygous condition and affects both males and female equally.
  • For the given question, let the autosomal gene be represented by H (dominant) and h (recessive)
  • According to the question,

Since the <em>mother</em> is homozygous her genotype would be hh and the <em>father</em> is heterozygous so his genotype would be Hh.

The following cross is made to know the genotypes of the children :

hh X Hh--------> Hh Hh hh hh

So the <em>possible genotypes of the children are Hh and hh as shown in the cross. </em>

Note : An image is attached representing the cross in a Punnett square.

  • The probability of an event = No. of favourable outcomes/total no. of outcomes

The probability of occurrence of genotype Hh would be = 2/4 = 1/2

Similarly, the probability of occurrence of genotype hh would be 2/4 = 1/2



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3 years ago
The big bang theory is one of the most accepted theories on the origin of the universe because of scientific evidence, such as
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2. Cosmic Microwave Background Radiation (CMBR) has been found by scientists to be coming from all directions in space, and is suspected to be 'left over' energy from the Big Bang.
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If you walk for 1.5 hours and travel 7.5km, what is your speed?
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<span>Average speed=distance/time=7.5 km/1.5hr=5km/hr</span>
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4 years ago
What is the difference between El Nino and La Nina in science terms of climate?
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Hope this helps

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3 years ago
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