Answer:
Natural selection is generally limited to modifying structures that were present in previous generations and in previous species
Explanation:
The basic idea of biological evolution is that populations and species of organisms change over time. Today, when we think of evolution, we are likely to link this idea with one specific person: the British naturalist Charles Darwin.
In the 1850s, Darwin wrote an influential and controversial book called On the Origin of Species. In it, he proposed that species evolve (or, as he put it, undergo "descent with modification"), and that all living things can trace their descent to a common ancestor.
Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population, the population violates the Hardy-Weinberg assumptions, and evolution occurs. The Hardy-Weinberg Theorem thus provides a null model for the study of evolution, and the focus of population genetics is to understand the consequences of violating these assumptions.
New gene variants (i.e., alleles) are produced by random mutation, and over the course of many generations, natural selection may favor advantageous variants, causing them to become more common in the population.
Answer:
The earth developed seasons during the Late Precambrian eon.
Explanation:
Answer:
Since the gene mutates at a rate of 0.76 base pairs every 17.1 million years, to find out the time it would take for 1 base pair to mutate can be calculated by dividing 17.1 million years by 0.76
17,100,000 ÷ 0.76 = 22.5 million years
The following equation can be used to describe this:
μ = [(r2/N2) − (r1/N1)] × ln (N2/N1) = (f1 − f2) × ln (N2/N1)
r1 = the observed number of mutants at time point 1
r2 = the observed number of mutants at the next time point
N1 and N2 are the numbers of cells at time points 1 and 2
Hope that answers the question, have a great day!
Answer:
depolarizing
Explanation:
According to my research on studies by different medical professionals, I can say that based on the information provided within the question the neuron is depolarizing. This is what happens when voltage-gated sodium ion channels are inactivated causing an increas in the neuron's membrane conductance for sodium ions.
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