Speciation forms new species.
Directional selection favors one extreme of a phenotype, which leads to evolution and adaptive change of a species.
Disruptive selection selects against the average and leads to evolution and genetic variation of a species.
Stabilizing selection favors the average individual in a population, which does not lead to adaptive change or evolution, and reduces variation.
Answer:
See the answer below
Explanation:
<em>When the salt water resulting from using salt to thaw ice and snow is washed off the road, the nearby plants along the roadside would be subjected to osmotic stress due to the lower water potential of the soil water when compared to that of their cells. Consequently, the plants are expected to lose water to the surrounding salt solution until an equilibrium is established between their cytosols and the soil solution. </em>
Answer:
0%
Explanation:
This question involves two distinct genes; one coding for seed shape and the other for seed colour. The allele for you seeds (R) is dominant over the allele for wrinkled seeds (r) in the first gene while the allele for yellow seeds (Y) is dominant over allele for green seeds (y).
In a cross involving RRYY (homozygous dominant for both traits) and RrYy (heterozygous for both genes), the following allelic combinations of gametes will be produced:
RRYY- RY, RY, RY, RY
RrYy- RY, Ry, rY, ry
Using these gametes in a punnet square (see attached image), 16 possible offsprings will be produced. The genotypes of the offsprings in the ratio 1:1:1:1 will be:
RRYY (4)
RRYy (4)
RrYY (4)
RrYy (4)
According to the question, offspring that have wrinkled seeds and yellow seed color will have genotype: rrYY or rrYy.
This genotype is not one of those that will be produced by the cross between a RRYY and RrYy parent. Hence, the probability of having an offspring with wrinkled seeds and yellow seed color is 0%
Answer:
d. All of these statements are true.
Explanation:
According to the "A Citizen's Guide to Radon" manual on the third page:
<em>"Radon comes from the natural (radioactive) breakdown of uranium in soil, rock and water and gets into the air you breathe. Radon can be found all over the U.S. It can get into any type of building—homes, offices, and schools—and </em><em>result in a high indoor radon level</em><em>. But you and your family are most likely to get your greatest exposure at</em><em> home</em><em>, where you </em><em>spend most of your time</em><em>."</em>
According to a study by Brazilian researchers, the greatest exposure to gas radon occurs indoors, such as tunnels, wineries, mines and homes. All of these environments are typical of developed countries that exploit environments to build cities and homes for the population.
Answer:
Elements are classified as metals, nonmetals, or metalloids. Can you use the periodic table to locate these groups of elements? What do these locations reveal about these groups of elements?
metals>> Group 1
Non-metals>> Group 14-16
Metalloids>> Group 13-16
Explanation:
