Red green color blindness is a biology problem that can lead to red green color blindness

Because red-green color blindness is inherited recessively with the X chromosome, males only need one disease-causing gene to be infected, because males have the other Y chromosome, and females need to have two disease-causing X chromosomes to cause disease.

There are also 500 women. The ratio of male color blindness to female carriers is always 1 to 1

This situation is:

Offspring produced by female color blindness (XBXB) and male normal (XBY).

The ratio of xbxb to xby is 1 to 1

Their boys must be colorblind.

As for the denominator, it doesn't make sense.

The red-green color blindness gene is on the X chromosome.

Male for xy therefore.

The red-green color blind gene frequency is 500 10000

The female is xx because it is recessive.

So. xx must be both.

Red-green color blindness gene. The probability is.

Answer]: C Erythromycin is a macrolide antibiotic, the antibacterial spectrum is similar to penicillin, and has a strong inhibitory effect on gram-positive bacteria, such as staphylococcus, Streptococcus pyogenes, Streptococcus greenis, Streptococcus pneumoniae, Streptococcus faecalis, hemolytic streptococcus, Clostridium, diphtheria bacillus, Bacillus anthracis, etc. It also has a certain inhibitory effect on gram-negative sclerotinia sclerotia, such as gonorrhea, spirobacteria, pertussis, brucella, legionella, meningococcal and Haemophilus influenzae, bacteroides, some dysentery bacilli and Escherichia coli, etc., and has no anti-tuberculosis effect.

In addition, it has inhibitory effect on mycoplasma, actinomycetes, spirochetes, rickettsia, chlamydia, Nocardia, a few mycobacteria and amoebic protozoa. Staphylococcus and Streptococcus bacteria such as Staphylococcus aureus are easily resistant to the product. It is characterized by penicillin-resistant strains that change sensitivity to this product.

The mechanism of action is mainly combined with the 50S subunit of ribonucleosomes, inhibiting peptidyltransferase, affecting the translocation process of ribonucleosomes, hindering the growth of peptide chains, and inhibiting the synthesis of bacterial proteins.

"Red-green color blindness" is a knowledge point in the third section of Chapter 2 of Compulsory 2 Biology in high school.

Red-green color blindness is partial color blindness, which is divided into red and green color blindness. Patients are unable to distinguish between red and green and see them as two hues: yellow for long waves (red, orange, yellow, green) and blue for short waves (blue, blue, violet).

Red-green color blindness is a recessive genetic disorder with X chromosomes, and the cause is controversial.

Myths about "red-green color blindness":Many people think that it will be wrong to drive through the traffic light with red-green color blindness, but it is actually wrong, because the red-green color blindness generally knows that they are color blind, so when they look at the red light, they will leave, and they will stop when they see the green light, because their color difference is reversed, so some people on the Internet think that red and green color blindness will not be able to drive the car is wrong, if it is full color blindness, there is no rut, and they can't drive the car completely.

The above content reference: Encyclopedia - red-green color blindness.

Among vertebrates, only mammals are red-green color blind. (Color blindness is relative to humans.) Humans have three types of vertebral cells: red, green, and blue).

Fish, amphibians, reptiles, and birds are all four types of vertebral cells, red, green, blue, and ultraviolet.

Mammals have two types of vertebral cells, yellow and blue, and only primates have changed back to three, red, green, and blue, but still can't see ultraviolet rays.

Of course there are some special, nocturnal animals that have no vertebral cells and are completely color blind. Because the light is too dark at night, there is no need to distinguish the colors.

As for invertebrates, it's complicated. Some can have 12 color receptors, such as shrimp crickets, which can distinguish 12 species, and the world is dazzling in the eyes of this animal. Some are just one of them, and you can only see yellow.

Dogs, cows, and others don't know.

X chromosome recessive inheritance.

There are more male than female patients.

Cross-genetics. Atavism.

A genetic drug for Alzheimer's disease has made a qualitative leap in the intelligence of the orangutan Caesar. But during a conflict with people, Caesar was sent to an animal care center. Note:

Dalton, a famous English chemist and physicist in the 18th century, bought a gift on Christmas Eve - a pair of "dark blue" socks for his mother. When my mother saw the socks, she felt that the colors of the socks were too bright, so she said to Dalton, "The color of these socks you bought is too bright, how can I wear them?"

Dalton wondered why his mother thought the socks were too bright because they were dark blue, not bright at all. Puzzled, Dalton went to ask his brother and the people around him, except for his brother, who shared his opinion, and everyone who was asked said that the socks were brightly colored. Dalton did not let go of this little thing easily, and after careful analysis and comparison, he found that he and his brother's color vision were different from others, and it turned out that he and his brother were both color blind.

Although Dalton was not a biologist or medical scientist, he became the first person to discover color blindness, and the first person to be found to have color blindness. For this reason, he wrote an article "On Color Blindness" and became the first person in the world to raise the problem of color blindness. Later, in his honor, people called color blindness Dalton's disease.