The English moth, Biston betularia, is often cited as an example of observed evolution. There are two colors of this moth, light anddark (typica and carbonaria). Kettlewell found that dark moths constituted less than 2% of the population prior to 1848. Then, the frequency of the dark coloration began to increase. By 1898, the 95% of the moths in Manchester and other highly industrialized areas were of the dark color. Using the moth example, analyze the events in order to identify support for the statement: natural selection changes populations, not individuals. Choose ALL that apply. A) Variation in the population existed. B) Color variation is a result of different gene combinations. In response to environmental change, moth coloration changed from light to dark. D) Due to natural selection, the ratio of different genetic combinations is changing E) Predator pressure resulted in the light colored genotype being removed from the gene pool. Evolution
Which of the following are functions (jobs) of the cell membrane?
Biological membranes have three primary functions: (1) they keep toxic substances out of the cell; (2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the cell and the outside environment; and (3) they separate vital but incompatible metabolic processes conducted within organelles.
A student studies art and learned that he has several layers including inner and outer cores the student will make a model of the inner and outer cores of earth which model would be most like earths actual inner and outer cores A: A pool of liquid inside a solid metal ball. B: Metal ball with a slightly smaller solid metal ball inside it. C: A solid metal ball in the middle of a pool of liquid. D: A pool of one type of liquid in the middle of a pool of another type of liquid
C: A solid metal ball in the middle of a pool of liquid.
Since the student is studying the earth, the core area is made up of a solid metal ball in the middle of a pool of a liquid.
The core is the inner most part of the earth.
It exists in the middle of the earth.
The core is divide into two layers; inner core and outer core.
The inner core is a solid ball of metal.
The outer core is a liquid metal under high temperature and pressure.
WILL GIVE BRAINLIEST!! Answer question in photo please
The rocks' forms and edges are smooth and appear to have been rounded. This is a hallmark of abrasion because the rocks lose their sharp edges and round out as a result of the constant rubbing and scraping action of wind-borne particles against them.
What is the final product of the Calvin cycle
The answer is glucose
The function of the Calvin cycle is to take CO2 from the air and bond it together to form the molecules that will make the sugar glucose. This process is called carbon fixation . The actual result of the Calvin cycle is not glucose, a 6-carbon sugar, but another molecule called G3P. G3P is an abbreviation for glyceraldehyde-3-phosphate. This molecule is later converted by other chemical reactions into glucose.
It was in my lesson.
Which method(s) can be used to join double-stranded breaks in DNA? (choose all that apply)a. homologous end joining b. polymerase chain reaction c. homologous recombination d. Non-homologous end joining
Option (a) and (d).
The breaks in DNA molecule may occur due to replication error and oxidizing agent. The double-stranded breaks in DNA can be corrected by Homologous end joining and non homologous end joining.
Homologous end joining is used to repair the DNA present in G2 nad S phases of the cell cycle. The homologous sequences of DNA is used to repair the DNA. Non homologous end joining occurs in the cell present at G0 and G1 phase of the cell cycle. The DNA broken ends are juxtaposed and later rejoin together by DNA ligase.
Thus, the correct answer is option (a) and (d).
A population is made up of individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype. What is the allele frequency of A1? Answer to 2 decimal places.
In population individuals where 149 have the A1A1 genotype, 18 have the A1A2 genotype, and 154 have the A2A2 genotype, so the allele frequency of A1 is 0.49.
What is the allele frequency?
The incidence of a gene variant within a population is represented by the allele frequency. Alleles are different versions of a gene that share the same genetic locus on a chromosome.
To determine the allele frequency of A1
There is the formula:
frequency of A1 = (2 x number of A1A1) + Number of A1A2/ 2 x population