Correct answer: B.
We know that s<span>ome populations have a high frequency of the mutant allele, which indicates that there was already a wide spreading of it so that when the disease attacked the population, cause the necessary selection to promote the high frequency of the mutant allele. If the mutant allele appeared only when the disease struck, the mutant allele frequency wouldn't be high because this is a process that takes time.</span>
We can't be sure that A. is true, we'd need more information as to whether there is any advantage in having at least one allele. We do know that it is a recessive allele, therefore, most likely, there isn't any advantage.
C. - we can't foresee whether the disease would come to a closure. The virus could evolve alongside with the selection and this mutated allele would not be of any use.
There is only a genetic advantage - D. - in being heterozygous if there is an advantage having only one mutated allele, which we don't know.
Answer:
the way root cells reproduce to increase root length
Explanation:
Virchow discovered how cells reproduce so this would be the most reasonable answer
Answer:
Spectroscopy is the study of the interaction between matter and electromagnetic radiation as a function of the wavelength or frequency of the radiation. Simply, spectroscopy is the study of color as generalized from visible light to all bands of the electromagnetic spectrum; historically, spectroscopy originated as the study of the wavelength dependence of the absorption by the gas phase matter of visible light dispersed by a prism. Matter waves and acoustic waves can also be considered forms of radiative energy, recently gravitational waves have been associated with a spectral signature in the context of the Laser Interferometer Gravitational-Wave Observatory as well. Spectroscopy, primarily in the electromagnetic spectrum, is a fundamental exploratory tool in the fields of physics, chemistry, and astronomy, allowing the composition, physical structure and electronic structure of matter to be investigated at the atomic, molecular and macro scale, and over astronomical distances.
The spectrum is determined by measuring changes in the intensity or frequency of this energy. The types of radiative energy studied include: Electromagnetic radiation was the first source of energy used for spectroscopic studies. Techniques that employ electromagnetic radiation are typically classified by the wavelength region of the spectrum and include microwave, terahertz, infrared, near-infrared, ultraviolet-visible, x-ray, and gamma spectroscopy. Dynamic mechanical analysis can be employed to radiating energy, similar to acoustic waves, to solid materials. The types of spectroscopy also can be distinguished by the nature of the interaction between the energy and the material example:Absorption- when energy from the radiative source is absorbed by the material. Elastic scattering and reflection spectroscopy determine how incident radiation is reflected or scattered by a material. Crystallography employs the scattering of high energy radiation, to examine the arrangement of atoms in proteins and solid crystals. Coherent or resonance spectroscopy are techniques where the radiative energy couples two quantum states of the material in a coherent interaction that is sustained by a radiating field. Spectroscopic studies are designed so that the radiant energy interacts with specific types of matter.
B is correct. Here's why:
A states that horses were once carnivores. Large, grinding teeth isn't used by meat eaters; those would be sharp, serrated teeth. This is incorrect.
C talks about migration from S.A. to N.A., and nowhere in the statements above does it mention South America, so that's incorrect as well (unless you know something I don't)
D states that horses share a common ancestor with all mammals. I don't believe the mesohippus was the ancestor of any dolphin species.
Hope this helps!
Sun which produces sunlight