Why are women often carriers of X-linked traits but rarely affected by them?

Answers

Answer 1

Answer: Women have two x chromosomes, compared to men who have one x and one y chromosome. Because of the two x chromosomes, one of them can override the other. In men they only have one x and one y, they don't have the extra x chromosome to override the allele.

Answer 2

Answer: Women have two X chromosomes.Recessive alleles on one X chromosome are often masked by dominant alleles on the other chromosome.Women will not be affected unless they receive two recessive alleles.

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Which of the following statements is true of imagined risks? A. They're unaffected by positive self-talk.
B. They're harmless, because they're imaginary.
C. They're a kind of negative self-talk.
D. They're a kind of positive reinforcement.

Answers

Let's go through the choices!

A. They're unaffected by positive self-talk.

Let's pretend you are scared of thunder. If you tell yourself, "I will not let thunder scare me; it will not hurt me," you will be less scared! So, A is not the answer.

B. They're harmless, because they're imaginary.

If you are scared of something, it can damage your mental health, which is not harmless. So, B is not the answer.

C. They're a kind of negative self-talk.

Being afraid of something is usually due to an overexaggeration in your mind. So, C is a good answer.

D. They're a kind of positive reinforcement.

Being scared is not positive. So, D is not the answer.

The answer is C!

Hope I helped! :)

The following statements is true of imagined risks: C. They're a kind of negative self-talk.

Further explanation

Which of the following statements is true of imagined risks?

A. They're unaffected by positive self-talk.
B. They're harmless, because they're imaginary.
C. They're a kind of negative self-talk.
D. They're a kind of positive reinforcement.

In human relation, imagined risk is an exaggeration of a threat that can make an individual to overreact or develop behaviors that affect the such individual confidence level. Imagined risks are imaginary and they are created out of fear and doubt. Another name for imagined risks is negative self-talk. Imagined risks exist only in a person’s mind.

One of the keys to successful human relations is overcoming the fear of imagined risks. To do this, stop using negative self-talk and replace it with positive self-talk. Positive self-talk seeks to bring the positive out of the negative to help you do better, or just keep moving forward. The practice of positive self-talk is the process that allows you to discover the obscured optimism, hope, and joy.

Learn more

Learn more about imagined risks brainly.com/question/1117850
Learn more about positive self-talk brainly.com/question/10652488
Learn more about positive reinforcement brainly.com/question/11641754

Answer details

Grade: 9

Subject: biology

Chapter: imagined risks

Keywords: imagined risks, positive self-talk, harmless, positive reinforcement, self-talk

What enzyme connects the new nucleotides together and proofreads them

Answers

The enzyme that connects new nucleotides together during DNA replication is called DNA polymerase.

What is DNA polymerase?

DNA polymerase is responsible for synthesizing a new DNA strand by adding complementary nucleotides to the existing template strand.

It catalyzes the formation of phosphodiester bonds between the nucleotides, thereby linking them together and forming a continuous DNA molecule.

DNA polymerase also has a proofreading function known as 3' to 5' exonuclease activity. As it adds nucleotides to the growing DNA strand, it can detect and correct errors in base pairing.

If it identifies a mismatched nucleotide, it removes it through the exonuclease activity and replaces it with the correct nucleotide, ensuring high fidelity in DNA replication.

Learn more about DNA polymerase here: brainly.com/question/29482961

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DNA it is a string of dna which can be prooved anytime or you can call it DNA replication

clonal selection of lymphocytes leads to the development of which type of cells? a. effector cells and b cells b. t cells and memory cells c. effector cells and memory cells

Answers

b. t cells and memory cells

These immune cells produce a proper response chemical to combat the microbes. The initial exposure of the body to an infectious agent e.g. through a vaccine, triggers an immune response most of which rapidly diminishes after the vaccination. However some cells of the immune system called lymphocytes remain with a memory of that pathogen.As a result, if the same pathogen infects a vaccinated person, the memory cells remember and recognize it .

How are cis-trans isomers used for night vision?

Answers

Answer: 11-cis Retinal is the light-sensitive component of rod and cone photoreceptors, and this structural conformation in rod photoreceptors is vital for low-light vision (night vision)

Explanation: To detect light, photoreceptors (especially rods) employ the exceptional properties of 11-cis retinal. Rods transmits low-light vision, as only them have enough sensitivity to respond and to trigger vision .

11-cis retinal in rods are bound to an opsin signaling protein to form a visual pigment molecule. Its other isomer, the all trans retinal is isomerized to 11-cis retinal causing the branching of the polyene chain, deactivating opsin molecule and increasing sensitivity to light. This adaptation occurs rapidly in minutes in the dark, resulting in maximum sensitivity to light.

"Cis-Trans Isomerism in Vision
The retina, the light-detector layer in the back of our eyes, contains colored compounds called visual pigments. They are insoluble in water and can be extracted from the retina with aqueous detergents. In the dark these pigments are reddish (their name, rhodopsin, comes from a Greek word meaning rose-colored), but the color fades upon exposure to light.

Rhodopsin molecules contain a protein called opsin plus a derivative of vitamin A called 11-cis-retinal. In the dark, 11-cis-retinal fits nicely into the folds of the surrounding opsin. When light hits the rhodopsin, the 11-cis-retinal becomes all-trans-retinal and no longer fits into the cavity of opsin. The opsin and the all-trans-retinal separate. The change in rhodopsin conformation is eventually transmitted to the nerve cells in the eye and then the brain. The stereoisomerism of retinal is thus an important part of the vision process. Note that only one of the five double bonds is affected in this transformation, but when this one changes from cis to trans, the shape of the entire molecule changes. An enzyme later catalyzes the change of all-trans-retinal back to 11-cis-retinal so that it can once again bind opsin and wait for the next exposure to light.

The retinas of vertebrates have two kinds of cells that contain rhodopsin. These cells are distinguished by their shapes: rods and cones. The cones, which function in bright light and are used in color vision, are concentrated in the central portion of the retina, called the macula, and are responsible for the greatest visual acuity. The remaining area of the retina consists mostly of rods, which are used for peripheral and night vision. 11-cis-retinal is present in both rods and cones. However, the opsin is somewhat different in the two kinds of cells, and the cones have three different opsins, one kind each for perception of blue, green, and red colors."

Which is an example of a predator-prey relationship?a. The relationship between a duck and a pond of water.
b. The relationship between a lion and a zebra.
c. The relationship between a bee and a ﬂower.
d. The relationship between a hen and a rooster

Answers

The answer would be B

How many muscles are there in each ear of a cat ?

Answers

muscles in cat ear:
a cat has 32 muscles in each ear :)
because of it ,,it can rotate its ears up to 180 degree...
while humans have 6 muscles in each ear ...

32 muscles are there in a cat ears.

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