Prokaryotes have no nucleus therefore the prokaryotic chromosome or DNA is dispersed within the cell and is not enclosed by a separate membrane. In eukaryotes the chromosomes and DNA is located in the nucleus.
A molecular formula is What U did or used to have A molecule and A molecular Model is the molecule
Answer:
This disorder is caused by a recessive allele, its inheritance is sex-linked.
Explanation:
The disorder affects boys born to unaffected parents, this means that at least one of them has to be a carrier of the allele which causes the disease. So, if the allele was dominant, it would express in parents and sons. But, in this case, only is expressed in sons, so it can´t be dominant. Moreover, this condition has a sex-linked inheritance because it is always seen in boys and never in girls. This happens due to boys only have an X chromosome, so if they inherit the recessive allele of the disease, they will express it. On the other hand, girls have two X chromosomes, so if they inherit one copy of the recessive allele, they will be carriers and they won't be affected.
This disorder is never seen in females because they need to have two copies of the recessive allele. However, to have double copy, they should inherit one copy from their mothers and one copy of their fathers, but boys with the allele are affected and they die in early teens without having progeny. Therefore, a girl can't have a "carrier-father", so they will never have two copies to express the disorder.
B. some species die out when environmental changes occur
Answer: Thrombus Formation
Explanation:
Atherosclerosis is a chronic, progressive disease in which the plaques starts building in the walls of artery. These plaques are the deposition of the cholesterol and other lipids, calcium and inflammatory cells known as macrophages.
Once these substances starts depositing in the artery it can lead to thrombus formation which is not cured by itself.
The Atherosclerosis is the predisposes to the thrombus formation which can cause myocardial ischemia.
