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patriot [66]
3 years ago
11

Many different types of mutations can occur within the body. Sickle cell anemia is a disease that occurs when a mutation in a ba

se pair of the hemoglobin beta gene causes a single replacement of the amino acid glutamic acid by the amino acid valine. As a result of this mutation, the individual’s blood cells take on a sickle shape under certain conditions and form clusters that can block blood vessels and cause organ damage. mc017-1.jpg mc017-2.jpg Which type of mutation causes sickle cell anemia?
Biology
2 answers:
Anton [14]3 years ago
5 0
A point mutation causes sickle cell anemia. This is a single change in the 6th codon from the start of the HBB gene (codes for the beta-globin subunit).
Normally the 6th codon is for glutamic acid (codon is GAG)...but the point mutation happens at the A .... changing this codon to GUG ...which codes for Valine...
Turns out to be a very seriously bad single point mutation (17 nucleotides from the start of the gene).
Lynna [10]3 years ago
4 0

the answer is B missense

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The drug colchicine inhibits the formation of spindle fibers during mitosis. If you treat dividing plant cells with colchicine,
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Answer:

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Explanation:

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Therefore, the final cell after mitosis will be a cell with double the number of chromosomes -because if you remember, during interphase, genetic material is replicated so each daughter cell can have its copy-. Due to quality control in the process of cell divisison, this cell will mostly undergo apoptosis, otherwise, it could develop into cancer.

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Read 2 more answers
1. how are positive ions formed (what is gained or lost)? use potassium (k) as an example. how many protons and electrons does a
Levart [38]

Positive ions are formed when electrons are lost, for example, Potassium ion, K⁺ is formed when a Potassium atom, K losses one electron. A neutral atom of Potassium (K) has 19 protons and 19 electrons, and a positive ion of Potassium (K⁺) has 19 protons and 18 electrons.

Ions are charged particles formed when neutral atoms loss or gain electrons. When electrons are lost, positively charged particles called cations are formed, and when electrons are gained, negatively charged particles called anions are formed. Electropositive elements are more likely to form cations. Potassium (K) losses one electron in order to obtain a stable configuration, forming Potassium ion (K⁺).

For all neutral atoms, the number of protons is always equal to the number of electrons. The number of protons is the same as the atomic number. Potassium (K) has an atomic number of 19, thus it has 19 protons. Since Potassium (K) atom is a neutral atom, it will also have 19 electrons.

However, Potassium ion (K⁺) has lost one of its electrons, so it will have 18 electrons instead of 19. Therefore, Potassium (K) has 19 protons and 19 electrons, while Potassium ion (K⁺) has 19 protons and 18 electrons.

Learn more about ions here:

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