The reason why the Southern California steelhead run sizes has decreased by 90% is the construction of dams along water sources.
<h3>What is a dam?</h3>
The dam is a large structure that serves the purpose of holding back water and making its level to rise quite high. Dams could be used for the purpose of electricity generation.
The reason why the Southern California steelhead run sizes has decreased by 90% is the construction of dams along water sources.
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During gametogenesis, if
nondisjunction occurs in meiosis II (meaning that that at least one pair of
sister chromatids did not separate), the resultant effect will be two cells that
has the normal haploid number of chromosomes (n), one cell that has an extra
chromosome (n + 1), and one cell that has one missing chromosome (n - 1). In
summary, two of the gametes will be n, one will be n + 1, one will be n — 1.
Answer:
Allopatric speciation
Explanation:
Allopatric speciation, the most common form of speciation, occurs when populations of a species become geographically isolated.
