The brain and central nervous system shrink as we age.
<h3>What happens to the brain when we age?</h3>
The brain is one of the most important organs in our body because all the nerve signals are produced there for our body to function.
In the brain we find nerve connections through neurons. A particular aspect of them is that during childhood and adolescence they multiply as we learn new things.
However, once we reach the stage of old age, these nerve connections deteriorate and are reduced, therefore, the size of the brain and the central nervous system decreases.
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Answer: mother: XX^aa, father: X^YAa, son: X^YAa, daughter: X^X^aa.
Explanation:
Color blindness is a genetic disorder that affects the ability to distinguish colors. It is hereditary and is transmitted by an X-linked recessive allele. If a male inherits an X chromosome with the altered allele he will be color blind. In contrast, females, who have two X chromosomes, will only be colorblind if both of their X chromosomes have the altered allele. This is because <u>males have one X chromosome and one Y chromosome, while females have two X chromosomes</u>.
If the woman has normal vision, that means she cannot have both chromosomes affected. She can only have one affected chromosome (be a carrier) or none at all. Also, if she has blue eyes, which is a recessive trait, then both alleles are recessive. But the eye color is not on the X chromosome. For example, her eye color genotype can only be aa, because if she had at least one dominant allele she would have brown eye color. As for the other trait, she can be XX^, with X^ being an affected (carrier) allele or XX, i.e. both normal. So in summary, her genotype can be XXaa or XX^aa
If she has a brown-eyed male child who is also colour blind, he has inherited the allele for colour blindness from his mother, since the father does not pass on an X chromosome to the male children, only the Y. With this we can now rule out the mother's XXaa genotype since she had to have passed on her affected X^ chromosome. Then the genotype of the mother is XX^aa. And since her mother can only pass on one allele to (recessive) because she does not have allele A, the dominant that determines her brown eye color can only come from the father. So the genotype of this son is X^YAa. The female daughter has color blindness and blue eyes. So she had to inherit the affected X^ chromosome from the mother (which we already know she has) and an affected X^ chromosome from the father, because the daughter needs to inherit both affected X^ chromosomes to develop the disease. And if she also has blue eyes, she had to have inherited a recessive allele from the mother and another from the father. So with this information we can say that the father's genotype can only be X^YAa. Because the father must have both A and A alleles of the same eye color, because he passed the dominant one to the son and the recessive one to the daughter. At last, the genotype of the daughter is X^X^aa.
Answer:
Meteorologist
Explanation:
they are called meteorologist
Answer:
Nucleus
A specific organelle of eukaryotes cells enclosed almost the whole cellular genome. It has a nuclear envelope which is a double membrane. It contains the chromatin, nucleoplasm, nucleolar, and primary transcripts.
It controls cell metabolism and reproduction. Additionally; the nucleus contains the DNA, which carries the information that is used to make proteins through the messenger RNA
Ribosome
These are organelles that are either found attached to the rough ER or suspended in the cytoplasm
Ribosomes are sites for protein synthesis a carry out this function by arranging the amino acids. The role of ribosomes is the synthesis of mRNA and then protein.
Endoplasmic reticulum
This is a web of the canals filled with fluid. They contain material throughout the cells, the rER and the sER are two types of this organelle.
Ribosomes are present on rough ER and assist in the movement of proteins to the Golgi body. The making and transportation of lipids is the function of the smooth ER.
Golgi apparatus
They are also called Golgi bodies that are stacks of flattened membranous stacks.
It intervenes in:
movement of RER proteins to secretory vesicles
Synthesis of proteoglycans and glycolipids and sulfation of glycolipids
Protein Maturation
The transfer of secreted products
O-glycosylation of certain proteins.