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2 years ago

Describe the flow of blood from the umbilical vein to the descending aorta in the developing fetus.

1 answer:

n200080 [17]2 years ago

8 0

Oxygen and nutrients from the mother's blood are transferred across the placenta to the fetus through the umbilical cord. This enriched blood flows through the umbilical vein toward the baby's liver. There it moves through a shunt called the ductus venosus. This allows some of the blood to go to the liver.

A small amount of the blood continues on to the lungs. Most of this blood is shunted through the ductus arteriosus to the descending aorta. This blood then enters the umbilical arteries and flows into the placenta. The oxygen rich blood then returns to the fetus via the third vessel in the umbilical cord (umbilical vein). The oxygen rich blood that enters the fetus passes through the fetal liver and enters the right side of the heart.

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How do photoautotrophs make energy?

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Tallness (T) in snapdragons is dominant to dwarfness (t), and red (R) flower color is dominant to white (r). The heterozygous co

laila [671]

Answer:

E. 6:3:3:2:1:1

Explanation:

Look at the attached picture to see the Punnett square for your problem.

The cross for this is snapdragons who are heterozygous for both traits so the cross would be:

As you can see in the image, you have the following genotype combinations with the corresponding phenotype combinations:

GENTOTYPE PHENOTYPE NUMBER

TTRR Tall - Red 1

TtRR Tall - Red 2

TTRr Tall - Pink 2

TtRr Tall - Pink 4

TTrr Tall - White 1

Ttrr Tall - White 2

ttRR Short - Red 1

ttRr Short - Pink 2

ttrr Short - White 1

The following phenotype combinations in summary would then be:

Tall - Pink: 6

Tall - Red: 3

Tall - White: 3

Short - Pink: 2

Short - White: 1

Short - Red: 1

So the ratio is 9:3:3:2:1:1

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3 years ago

Which of the following properties of transposable elements allows them to contribute to the C-value paradox?A. Their copy number

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Answer:

All of these choices are correct.

Explanation:

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Thus, the correct answer is option (D).

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