Compare and contrast immune tolerance with licensing

Answer: C. Homologous chromosomes are separated in meiosis but not in mitosis.

Explanation: There are two main types of division that take place in eukaryotic cells, mitosis, and meiosis. Mitosis is the type of division that is used for growth, repair, and replacement of tissues. Therefore it is not necessary that the cells have  different chromosome numbers or are varied genetically in the daughter cells in the case of mitosis.

Meiosis is the division that takes place to form the gametes for sexual reproduction. It is important in the first stages of meiosis I, to introduce variation and to halve the chromosome number.

Chromosomes numbers are halved (from 46 to 23) during meiosis I because the gametes (sperm and egg) come together and fuse during fertilization to form a zygote. When this fusion occurs (23 from the zygote and 23 from the egg), the chromosome number needs to be returned to that of the parent cell (46).

Genetic variation is introduced during synapsis which only occurs in meiosis, not mitosis. Homologs exchange genetic information during crossing over of synapsis. Entire chromosomes also separate during meiosis I.

At the end of meiosis, four genetically unique cells are  produced with half the number of chromosomes as the parent cell (23 cromosomes) . After the process of mitosis is completed, two cells genetically identical to each pther are produced and have the same number of chromosomes as the parent cell (46 cromosomes).

Genetic variation is actually important because of changing environmental conditions.

The answer is d............

• It is important for the scientists to grow the tissues that have a built in system to supply blood to decreases the chances of organ rejection.

• There is a very serious issue regarding this the transplanted organ does not gets the vascular blood supply which is the main reason for organ rejection.

• If there will be tissues with its own blood supply then it will not be ejected by the body.

A function of the cytoskeleton is - A. Helps a cell keep its shape and a function of a vacuole - C. Storage of materials.

Cytoskeleton

• a complex,network of interlinking filaments made of protein

• present in the cytoplasm of eukaryotic cells

• helps cells keep their shape and internalorganization
• allows cells to complete essential functions like division and movement by providing support

Vacuole:

• a space of cell without cytoplasm filled with fluid
• storage and disposal are its roles
• storefood or other nutrients for cellular need
• store waste and toxic products

Thus, A function of the cytoskeleton is - A. Helps a cell keep its shape and a function of a vacuole - C. Storage of materials.

Learn more about vacuoles:

brainly.com/question/15711894

Answer:

Genetic drift reduces the size of gene pool of the population.

Explanation:

Genetic drift is any chance event that results in changes in the allele frequency of a population. The event either fixes an allele on the particular locus or makes the population to lose that allele.

Hence, genetic drift changes the genetic frequency by removal of a particular allele or by fixing it in the gene pool. Both conditions lead to reduced genetic variations in the population. And since genetic drift reduces the size of the population, the gene pool of the population would also shrink due to loss of alleles from it.