Answer:
1.
•After the left ventricle contracts, the aortic valve closes and the mitral valve opens, to allow blood to flow from the left atrium into the left ventricle.
•As the left atrium contracts, more blood flows into the left ventricle.
•When the left ventricle contracts again, the mitral valve closes and the aortic valve opens, so blood flows into the aorta.
2.
•Diffusion is defined as the movement of individual molecules of a substance through a semipermeable barrier from an area of higher concentration to an area of lower concentration.
Explanation:
Answer:
Chromosome 21 in figure D is the result of a process known as non-disjunction
Explanation:
Meiosis is the process of cell division that serves to obtain gametes, cells with exactly half the chromosome load of the species. This process involves the equal distribution of chromosomes in each daughter cell.
Non-disjunction is an alteration in the separation of the sister chromatids during meiosis, resulting in a gamete with non-separated sister chromatids, which when joined to a normal gamete can produce an organism with an extra chromosome.
In the karyotype shown in the photo, the non-disjunction in chromosome 21 produces a trisomy, a type of aneuploidy seen in Down syndrome.
Learn more:
Trisomy brainly.com/question/484286
Answer:
The process of Mitosis ensures that each new cell receives the proper of chromosomes
Cell bio is important so that we can know more about cells and how they function
Answer:
Edwin Hubble discovered that the universe was expanding. he used his known 100 inch telescope to discover that our milky way was one of many galaxies. that these galaxies are part of an ever expanding universe. This discovery changed the way we and scientists look at the universe
