Hairy knuckles are dominant to non-hairy knuckles in humans.
HH: Homozygous Hairy Knuckles
Hh: Heterozygous Hairy Knuckles
hh: Homozygous Hairy Knuckles
Bobtails in cats are recessive. Normal tails are dominant.
Tt: Heterozygous Normal Tail
TT: Homozygous Normal Tail
I hope this is what you where asking. If not just send back a comment with the question and I’ll help you from there. Have a great day.
TRUE, Epithelial cells are avascular, they have not blood vessels. The only way your "true" outer skin can get nourishment is by diffusion / osmosis from connective tissue just below it. The observable part of your skin is actually dead. Among other reasons, it is too far from the vascular connective tissue to diffuse it's nourishment.
Adrenaline, Cortisol, Norepinephrine.
<span>Humans did not evolve from apes,
gorillas or chimps. We are all modern species that have followed
different evolutionary paths, though humans share a common ancestor with
some primates, such as the African ape. The timeline of human evolution is long and controversial, with significant gaps.</span>
Answer:
The correct answer is "There are several mechanisms that explain why a hormone have different effects in different cells. These mechanisms include: multiple receptors for the same hormone, a single receptor coupled to different pathways and hormones interacting with receptors for other molecules".
Explanation:
Hormones are among the most versatile molecules of the body, responsible for different biological processes such as human growth, sex development and metabolisms. Hormones are responsible of these complex biological processes because they have drastically different effects in different cells. There are several mechanisms that explain why a hormone have different effects in different cells. These mechanisms include:
- Multiple receptors for the same hormone. For instance, there are multiple receptor for dopamine, a hormone and neurotransmitter responsible for different functions such as movement, memory, sleep and motivation.
- A single receptor coupled to different pathways. Most hormone receptors act with a cascade of signaling. This in consequence results in a single receptor interacting with different molecules having multiple effects.
- Hormones interacting with receptors for other molecules. One example is the action of one metabolite of progesterone named allopregnanolone. This metabolite interacts with GABA-A receptor, which gives it anxiolitic properties.
