Answer:
Brain consists of three major parts- cerebrum, cerebellum and the brain-stem.
Explanation:
Functions-
A) Cerebellum- helps body move more slow.
B) Cerebrum- Largest part of the brain consists of right and left half.
C) Hypothalamus- Regulates eating and drinking and body temperature.
D) Medulla- Controls basic life functions like heart rate.
E) Meninges- membranes that surround and protect the brain and spinal cord.
F) Midbrain- Plays a role in the maintenance of consciousness.
G) Pons-Controls movement of the eye and helps in auditory and visual processing
H) Thalamus-Passes signals from the spinal cord to the brain and controls breathing
I) Frontal lobe- Reasoning of judgement.
J) Partietal lobe- sense of touch of vibration.
K) Temporal lobe- Auditory processing and word meaning.
L) Occipital lobe- vision.
The Afrikaners are an example of a founder effect that occurs when population and the random decrease in genetic variation is an example of genetic drift.
Explanation:
When some individuals from a population move to form a new colony, this phenomenon is called founder effect as in case of Afrikaners. The small population or group of individuals forming a new colony may not exhibit the full genetic diversity of the population they were once the part.
The alleles would get expressed in different frequencies than it would have in original population.
There are chances that some alleles are lost or missing also. The new colony formed has small population so chances of genetic drift are very strong.
Genetic drift does not depend upon the benefit or harmful effect of the alleles as it occurs merely by chance sampling. The small population of Afrikaners felt the effect of genetic variation hence strong genetic drift is seen in them.
Mimicry:
. favors behavior of similar species that is harmful
. Structural adaption
Camouflage:
. Structural adaption
. Natural selection favors species' resemblance to environment
Mutations can't result in a change in appearance.
