Fossils up to 75,000 years old can be dated with Carbon-14.
Radio isotopes can be used for the age determination of the fossils. Carbon-14 is a common isotope which is used for that purpose. But the half- life of the Carbon-14 is relatively small as 5730 years. That means the amount of Carbon-14 will be half after every 5730 years. Hence, decay is very fast. So Carbon-14 cannot be used forage determination which is more than 75000 years due to the low accuracy.
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Three of the four nitrogenous bases that make up RNA — adenine (A), cytosine (C), and guanine (G) — are also found in DNA. In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3).
Penicillin was an accidental discovery I believe
Both are made up of cells, charisma has a goldfish she keeps in a tank. she planted several underwater plants in the bottom of the tank.
<h3>How long do goldfish live for?</h3>
Goldfish have a lifespan Of about 10-15 years, with some sorts living up to 30 years when occupied with proper maintenance.
Thus, Both are made up of cells.
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In the study of Gigord and colleagues using Elderflower orchids, the allele frequencies of yellow and purple flowers varied such that when the yellow allele started to become rare, the reproductive success of purple flowers decreased and the reproductive success of yellow-flowered individuals increased in a process known as <u>frequency-dependent selection.</u>
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Frequency-dependent selection is an evolutionary process in which the fitness of a phenotype or genotype is dependent on the frequency of that phenotype or genotype in a particular population.
- Positive frequency-dependent selection raises the fitness of a phenotype or genotype as it becomes more prevalent.
- In the case of negative frequency-dependent selection, the fitness of an increasingly prevalent phenotype or genotype diminishes.
In a broader sense, frequency-dependent selection involves biological interactions that make the fitness of an individual dependent on the frequencies of other genotypes or phenotypes within the population.
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