Answer:
The reproductive success of these people would be:
A) lower.
B) higher.
C) higher.
D) lower.
Explanation:
Vitamin D is a type of secosteroid and its synthesis in the epidermis is dependent on sun exposure (UVB radiation). This vitamin is key to have normal growth and to properly absorb calcium, magnesium, and phosphate.
Melanin, on the other end, is a natural pigment also found on skin that is responsible for our skin color and protects our bodies from UVB radiation damage. On people with darker skin tones, the higher levels of melanin hinder Vitamin D synthesis since it acts as a natural protector against the sun.
For this reason, light-skinned people (low melanin levels, high vitamin D synthesis) live better in the poles, where they can absorb limited UV because of the weaker sunlight. Dark-skinned people are better off living in regions with the stronger sunlight, like the tropics.
Answer:
4N
Explanation:
Mitosis is the process whereby a cell duplicates or produces another identical copy of itself. The mitotic process, which occurs in four main stages produces two daughter cells that are genetically identical to the parent cell. For example, a diploid organism (2n) will produce two daughter cells with 2n from mitosis.
However, in a case whereby a plant cell (A) screws up mitosis during metaphase and pulls full copies of all chromosomes to one side. This would result in one daughter cell having 4n or tetraploid number of chromosomes. Ideally, mitosis separates the chromosomes equally into the two daughter cells to have 2n each. If one cell has all chromosomes, it means that cell will have all the 4n.
For example, in a diploid human cell with 46 chromosomes (2n). Mitosis should occur in such a way that each daughter cell will have a diploid 46 number of chromosome (2n). However, if all the chromosome ends up in one cell during mitosis, that cell will have 92chromosomes, which is 4n or tetraploidy.
Genetic variation can be defined as the difference in the DNA sequences between the individuals in the population
<u>Explanation:</u>
- Antibiotic resistance in bacterial populations is caused by natural selection of bacteria that inherit mutations that make them resistant to the antibiotics,this sentence describes the source and preservation of genetic variation.
- The Mutation is one of the genetic variation or disorder, and probably bacteria choose mutation to become repellent to antibiotics
- In some of the cases of spontaneous bacteria have been obtained from other sets of bacteria through the process and make the bacteria repellent to an antibiotic.
- They survive antibiotic treatment and increase in numbers by natural selection.
- Natural selection can be stated as the process in which organism survive and reproduce adapting to the environment
