How does genetic drift cause alleles to become fixed? What are the forces of evolution in gene flow? How do populations evolve the gene pool? How can new species arise from sympatric speciation? How does speciation take place in convergent evolution?
How does genetic diversity arise within a species? Describe at least four different mechanisms. Explain Fixation of alleles (what does it mean, and how does it happen?) (a) What is a new allele? (b) What is a new gene? (c) Explain their differences. ...
The alleles for "no tusks" were passed along over just a few generations. The result: As many as half of the female elephants in some modern populations have no tusks [source: BBC News, New York Times]. Unfortunately, this isn't really a happy ending for the elephants, since their tusk...
In 2019, David Liu's team introduced a new precision genome editing technique called prime editing (PE), which differs from base editing by allowing up to 12 base substitutions without relying on double-strand breaks or donor DNA (Anzalone et al.2019). The PE system consists of two key co...
In molecular terms, alleles are different forms of the same gene. There can be more than two alleles of a gene in a population of organisms. But any given organism has only two alleles at the most. Shorter plants usually cannot compete with the taller forms in the wild. A short mutant ...
as it introduces alleles at low frequency (Hill and Rasbash, 1986). However, epistasis makes additive effects conditional on genotype, so that the effect of new mutations may change with the mean. In the long term, the genetic variance will evolve unpredictably, as new alleles introduced by ...
Mike Usry Jr.:There are 34 out of 35 alleles that match … It seems shocking to me. Thirty-four out of 35 DNA markers sounds like a stunningly close match to Angie Dodge's killer, but the reasons police honed in on himinstead of any of his other relatives are det...
Apoptosis has been established as a mechanism of anti-cancer defense. Members of the BCL-2 family are critical mediators of apoptotic cell death in health and disease, often found to be deregulated in cancer and believed to lead to the survival of malign
(or more) speciation events, such that the descendent species each contains alleles that date back to before the speciation events. The descendent species may each independently fix one or other of the ancestral alleles (independently sorting the alleles). When sister species fix different alleles ...
What is the impact of the population size on the variability of the frequencies of alleles? Explain how natural selection can reveal latent variation in a population. Nature selection is the process by which favorable traits tend to increase in frequency over time. How does...