The original source of energy in a food chain is the sun.
Overproduction
Most species produce more offspring than can survive.
Competition
Since living space and food are limited, organisms must compete for the necessities.
Variation
Differences between individuals in a population.
Adaptations
Any kind of inherited trait that improves an organism's chances of survival.
Natural selection
The environment selects organisms with optimal traits to be the parents of the next generation.
Speciation
Over many generations, favorable adaptations accumulate and may result in a new species.
The option that represents the correct flow of events during meiosis II is A) sister chromatids pulled to opposite poles, nucleoi form, cytokinesis.
Recessive traits often seem to disappear because two recessive alleles are needed to produce the recessive phenotype. They can skip a generation and then reappear if an individual inherits two copies of the recessive gene. Mendel's experiments revealed that phenotypes could be hidden in one generation, only to reemerge in subsequent generations.
Recessive traits disappear because recessive alleles can hide out in heterozygotes, allowing them to persist in gene pools and natural selection can only see the phenotype, not the genotype. While harmful recessive alleles will be selected against and it's almost impossible for recessive alleles to completely disappear from a gene pool.
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DNA fingerprints, such as those first used by Alec Jeffries, reveal variations in the locations of restriction enzyme recognition sites between different individuals.
DNA fingerprinting is a techniques that can identify the proportion of similarity or dissimilarity between two samples of gene. It is extensively used in forensics, to find the maternal and paternal relations. The principle of fingerprinting lies in recognizing the unique bands of DNA that are then matched with the other sample.
Restriction enzymes are also known by the name molecular scissors. These are endonucleases that cut the bases of DNA at the inside at specific locations only.
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