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vodomira [7]
3 years ago
8

What are the two nodes in the heart that are the pace makers?

Biology
2 answers:
Maksim231197 [3]3 years ago
6 0
It would be the sinoatrial node and atrioventricular node.

Hope This Helps You!
Good Luck Studying :)
Lorico [155]3 years ago
6 0
The sinoatrial node<span> is the normal natural </span>pacemaker<span> of the </span>heart<span> and is responsible for the ... It is an elongated structure extending between 1 and </span>2<span> cm on the right from the crista terminalis the crest of the right atrial appendage, and runs</span>
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Mutations in skin cells that result in melanoma are considered _____ mutations; a mutation that can be passed on from parent to
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Urea and uric acid are products of the breakdown of:
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2 years ago
Imagine that a newly discovered, recessively inherited disease is expressed only in individuals with type O blood, although the
erastova [34]

Complete question:

Imagine that a newly discovered, recessively inherited disease is expressed only in individuals with type O blood, although the disease and blood group are independently inherited.

A normal man with type A blood and a normal woman with type B blood have already had one child with the disease. The woman is now pregnant for a second time.

Assuming that both parents are heterozygous for the gene that causes the disease, what is the probability that the second child will also have the disease? Express your answer as a fraction using the slash symbol and no spaces (for example, 1/2).

Answer:

The probability that the second child will also have the disease is 1/16.

Explanation:

<u>Available data:</u>

  • Two genes independently inherited: one for blood type, the other for disease
  • Man with type A blood  x  Woman with type B blood
  • Both parents are heterozygous for the gene that causes the disease; Dd

If the man has A blood, and the woman has B blood, and they already have an affected child, this means that they must be heterozygous for blood type too.

Cross:  

Parentals)           AiDd         x      BiDd

Gametes)  AD  Ad  iD  id       BD  Bd  iD  id

Punnett square)      AD       Ad       iD       id

                     BD   ABDD  ABDd  BiDD BiDd

                     Bd   ABDd   ABdd   BiDd Bidd

                     iD    AiDD    AiDd    iiDD   iiDd

                     id    AiDd     Aidd     iiDd    iidd

F1) <u>Genotype</u>:

1/16 ABDD

2/16 ABDd

1/16 ABdd

1/16 AiDD

1/16 BiDD

2/16 AiDd

2/16 BiDd

1/16 Aidd

1/16 Bidd

1/16 iiDD

2/16 iiDd

1/16 iidd

<u>Phenotype:</u>

3/16 A/B normal

4/16 A normal

4/16 B normal

3/16 0 normal

1/16 0 affected by the disease.

3 0
3 years ago
What is one way human beings have disrupted the sulfur cycle?
Trava [24]

Answer:

A/D

Explanation:

D, Fertilizers put more sulfur in the ground than their should be.

A, fossil fuels, could also be the answer. When we combust fossil fuels we release the sulfur in them into the atmosphere when they should not be in the air.

3 0
3 years ago
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