CD8+ T cells is the type of cell attacks a variety of unwanted cells and causes those cells to undergo apoptosis
Apoptosis occurs normally when the development and the aging and as a homeostatic mechanism to maintain the cell populations in the tissues. Apoptosis can also occurs as the defense mechanism such as in the immune reactions or when the cells are damaged by the disease or the noxious agents
Apoptosis is basically form of the programmed cell death that is occurs in the multicellular organisms. the Biochemical events lead to the characteristic cell changes and the death. These changes may include the blebbing, cell shrinkage, the nuclear fragmentation, and the chromatin condensation, the DNA fragmentation, and the mRNA decay
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Radi Carry developed a theory named "<span>Spontaneous generation". This theory assumed that living creatures can be generated from non-living things and he used this theory in order to explain the origin of flies.
He carried out another experiment with three jars to check that bad air did not cause any flies.</span>
C. Because mutations are varieties
Answer:
e. Red segregated from brown in meiosis I, and straight segregated from curled in meiosis I.
Explanation:
A cross between two flies heterozygous for both genes produced an offspring with the phenotypic ratio of 9:3:3:1. This ratio is expected according to Mendel's law of independent assortment, which states that alleles of the same gene assort independently during gamete formation.
Before meiosis starts in flies, a single diploid cell duplicates its DNA, so each chromosome has 2 sister chromatids that contain the same information.
- During meiosis I, <u>the homologous chromosomes separate</u> into two daughter cells. The chromosome number is reduced by half, but each chromosome has two sister chromatids.
- During meiosis II, <u>the sister chromatids separate</u> and each daughter cell from meiosis I divides into two new daughter cells (to get the total of 4 haploid cells).
In a heterozygous fly, each homologous chromosome contains a different allele, and the sister chromatids are copies that carry the same allele. For that reason, both traits were segregated during meiosis I.
B. are trying to use the same resources
