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murzikaleks [220]
2 years ago
7

Since we started producing nuclear power in 1960, how common are large nuclear accidents (those that resulted in the major relea

se of radioactive material into the environment)?
Biology
1 answer:
zysi [14]2 years ago
3 0
Very, very rare. Uranium used in power plants is typically only 3% U-235 (the explosive stuff), while bomb-grade uranium is nearly pure U-235. Simply, the concentration of U-235 in reactor-grade uranium is too small to start a chain reaction and detonate like a bomb.
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The bones of the skull,spine,and rib cage make up the______ _______ _______
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Answer:

The axial skeleton is composed of the bones of the skull, ossicles of the ear, hyoid bone, vertebral column, and ribcage.

Explanation:

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2 years ago
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State two specialised cells found in plants​
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Answer:

xylem cell and phloem cell

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3 years ago
1. Which of the following traits is not characteristic of animals?
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1. <span>composed of cells with cell walls
2. </span><span>Vertebrates contain a backbone, while invertebrates do not.</span>
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3 years ago
Which function of prokaryotes is described by binary fission
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Binary fission refers to the type of asexual reproduction. It is the most general kind of reproduction in prokaryotes like bacteria. It takes place in some unicellular cells like Paramecium and Amoeba.

7 0
2 years ago
Having freckles (F) is dominant over not having freckles (f). A parent with freckles is crossed with a parent without freckles.
Step2247 [10]

Answer:

This is a trick question, and only because the question is vague

Explanation:

Use a Punnet Square to figure out the percentages.

If the parent with freckles (let's just call them Parent A) is homozygous dominant, their genotype would be FF.  The parent without freckles (Parent B) has a genotype of ff.

In any situation, the probability of these two having a child that is homozygous dominant for freckles is 0%.  (see punnet squares for more info).  

Now here's where it gets a little more confusing because the question is kind of vague on this.

Assuming that Parent A is homozygous dominant (both genes for this are dominant (FF)), then the probability of having a heterozygous (non-identical genotype letters, meaning they carry the recessive trait) genotype is 100%.  However, if Parent A is also heterozygous, then that percentage decreases to 50%

For Situation A (Parent A is homozygous dominant), the probability of a homozygous recessive genotype is 0%

For Situation B (Parent A is heterozygous dominant), the probability of a homozygous recessive child is 50%.

Please see the Punnet square I made for more information.

Key:

- Homozygous Dominant: FF

- Heterozygous Dominant: Ff

- Homozygous Recessive: ff

(heterozygous recessive does not exist, because that would mean one of the genes is dominant, which would overpower the recessive gene)

I really hope this helps, and if you're confused by this, please do not hesitate to let me know!

8 0
3 years ago
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