Why do we get ill when we get stressed?

1 answer:

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When your body is stressed you are constantly in the fight or flight mode. Your heart beat is higher, blood pressure is up and constant alertness is given full attention to your bodies defenses. Ther are a lot of flowing hormones to be able to use all of your strenght and more to survive. When this continues for long periods of time you dont sleep, eat and think properly and your body's immune system is weakened and you get sick easier.

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The beaker in the illustration below contains two solutions of salt with different concentrations (measured by molarity, M). The

nexus9112 [7]

Answer:

Either option A or option C

Explanation:

Here if the concentration of the two solution was given then it would have been very easy to interpret that which solution will start moving to the other compartment.

Here there can be two cases - salt from the solution which has higher salt concentration, will start moving to the solution having lower salt concentration and the same will happen for water which shall start moving from region of high concentration to region of lower concentration.

Thus, two option i.e. option A and option C are correct.

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In fruit flies, straight wings are dominant and curly wings are recessive. What will the generations look like? Assume that Mend

anzhelika [568]

Answer:

The P generation has straight wings and curly wings.

The F1 generation has all straight wings.

The F2 generation has straight wings and curly wings.

Explanation:

This question involves a single gene coding for wing shape in fruit flies. The allele for straight wings (S) is dominant over the allele for curly wings (s). This means that allele "S" will mask the phenotypic expression of allele "s" in a heterozygous state.

According to the question, the cross follows all Mendel's method of crossing two true breeding parents with opposite traits. Hence, the parent generation (P generation) will be between a truebreeding straight wings parent (SS) and a truebreeding curly wings parent (ss). (See attached image for full cross).

Since the straight wing allele (S) is dominant, all the F1 offsprings will possess straight wings with the genotype: Ss, which is heterozygous.

If this F1 offsprings are self-crossed i.e. Ss × Ss, four possible offsprings in the phenotypic ratio 3 straight wings : 1 curly wing will be produced in the F2 generation. The offsprings will possess the following genotypes: SS, Ss, Ss, and ss.

Offsprings SS, Ss, and Ss will all be phenotypically straight-winged

Offsprings ss will be phenotypically curly-winged.

In overall, this means that P generation has both straight and curly wings (SS and ss), F1 generation has only straight wings (Ss), F2 generation has both straight and curly wings (SS, Ss and ss).