Answer:
<u>3) Uncontrolled cell division occurred as a result of gene mutations</u>
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Explanation:
Spontaneous modifications within the genome may occur during the process of cell division. When copies of the DNA inside the cell are made, these mutations cause errors; and can include small single nucleotide polymorphisms, and large scale additions or deletions across multiple genes.
Some, like somatic mutations, exist only inside vegetative (body) cells, that cannot be passed onto offspring. This is caused by several factors like
- UV radiation,
- chemical mutagens,
- infective agents
UV radiation damages strands of DNA, by causing dimers to form; here, consecutive nucleotide bases covalently bond instead of those on the complementary strand. This conformational change causes errors in DNA proofreading and repair mechanisms where bases are not well-incorporated into the strand- tumors (clumps of uncontrolled cell growth) may form, resulting in melanoma, a type of skin cancer.
Answer:
Australian marsupials ,
cichild fish
Darwin's finches
a striking example is the radiation, begin in the paleogene periods of basal mammalian stuck into form adapted to running ,liping, flying, and swimming.
These chromatids are divided during anaphase and attracted to the opposite poles of the cell. This division produces 92 distinct chromatids in the cell, which are regarded as 92 chromosomes.
In the cell at anaphase 1, how many chromosomes are there?
chromosomes with 46 in total. From from point on, we will refer to these divided sister chromatids as daughter chromosomes. Each end of the cell has an identical and full set of 46 chromosomes, or 23 pairs of homologous chromosomes, at the end of anaphase; they are still diploid.
Metaphase 1 has how many chromosomes?
chromosomes with 46 in total. In metaphase I, there are a total of 46 chromosomes, each of which is made up of two sister chromatids. There are 23 homologous pairs with two full chromosomes in each. throughout telophase I.
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A disadvantage of captive breeding is the offspring don't grow up in an natural environment
