The afrikaner population of dutch settlers in south africa is descended mainly from a few colonists. today, the afrikaner popula
tion has an unusually high frequency of the gene that causes huntington's disease. huntington's disease is an autosomal dominant disease and only one allele is needed for the disease (hh, hh). the afrikaners are an example of a founder effect. it is also an example of genetic drift. how is the founder effect related to the concept of genetic drift? a.reduced genetic variation of this small population means that the population may not be able to adapt to new selection pressures.
b.in a small population, the more advantageous trait becomes more common. if this continues, eventually, all individuals in the population will have huntington's disease.
c.the small population size means that the new colony may have reduced genetic variation from the original population and that variation, in this case, included the dominant allele for huntington's disease.
d.there are three sources of genetic variation: gene flow, sexual reproduction and mutation. in the case of the afrikaners, once the settlers arrived in africa, these three sources had little impact on the gene pool and variation.
C. The small population size means that the new colony may have reduced genetic variation from the original population and that variation, in this case, included the dominant allele for Huntington's disease.
Explanation:The small population size means that the new colony may have reduced genetic variation from the original population and that variation, in this case, included the dominant allele for Huntington's disease. Genetic drift, along with natural selection, mutation, and migration, is one of the basic mechanisms of evolution. In this case, it was chance that the settlers all carried the allele for Huntington's disease.
Its C. <span>the small population size means that the new colony may have reduced genetic variation from the original population and that variation, in this case, included the dominant allele for huntington's disease.</span>
Owls are found in various territories, <em>for example, deserts, woodlands, prairies and even the Arctic tundra</em>.
They home in <em>trees, in gaps in the ground, in horse shelters, and in caverns.</em> And keeping in mind that numerous different winged creatures relocate to hotter spots throughout the winter, most owls don't. They live in a similar spot throughout the entire year.
Circadian beat length varieties such as <em>brisk riser and night owls. </em>
<em>Circadian rhythms are cyclic natural changes</em> including the physical, mental, and conduct fucntioning of a life form, following a pattern of <em>around 24-25 hours</em>.
Their primary controller is <em>light and dimness in the earth. </em>
<em>Night owls</em> are progressively smart and imaginative and bound to land lucrative positions than warblers.
They have a spot to call their own domain and where they can conceal during the day from predators.
They likewise approach loads of various nourishment sources in light of the other living animals in the woodland.
The type of mutation that would cause the most dramatic change in the polypeptide or protein product of a certain gene is the base-pair deletion. A deletion is a mutation in which the part or the base is lost during the process of replication. Any number of nucleotides can be deleted from a single base to an entire piece of chromosome.
Cytotoxic T cells secrete granzymes and perforins when targeting cells. Additionally they secrete cytokines such as IFN-, TNF-α and TNF-β that act to activate macrophages and help kill infected cells.
