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photoshop1234 [79]
3 years ago
13

Veins have a much lower blood pressure than arteries. Which of these prevents backflow of blood in veins?

Biology
2 answers:
posledela3 years ago
5 0
I Think it would be B One-way valves in veins
Crank3 years ago
3 0

Answer:

B. one–way valves in veins

Explanation:

Veins are thin-walled blood vessels as compared to the arteries. The veins are superficially located under the skin in the body. They bring deoxygenated blood to the heart form the body cells. Since the blood pressure in the veins is low, the presence of valves along their length to prevent backflow of blood away from the heart.

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In a certain plant, tall stems (t) are dominant to short stems (t). a farmer crosses a short-stemmed plant with a heterozygous l
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The answers would be:

Genotype                Phenotype

     Tt                      Tall stemmed

     tt                       Short stemmed

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

<u />

<u>You can read on to see how this was done:</u>

Tall stems (T) are dominant to short stems (t).

First figure out the genotypes of the parents. We have a short-stemmed plant and a heterozygous long-stemmed plant cross.

For short stem to occur, you need 2 pairs of short alleles. So the first parent would have a genotype of tt.

Heterozygous long-stemmed means that the parent has one of each allele. So the genotype of the second parent would be, Tt.

Now we can make our Punnett Square.

tt x Tt

<u>       t        t  </u>

<u>T |  Tt  |   Tt</u>

<u>t  |   tt  |   tt</u>

Let's list down the genotypes and phenotypic results.

Genotype        no.         Phenotype

     Tt                 2           Tall stemmed

     tt                  2           Short stemmed

So from that we can answer the other questions:

Genotypic ratio : 2:2 or 1:1

Phenotypic ratio: 2:2  or 1:1  

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3 years ago
Which of the following is an anion
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