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3 years ago

Spontaneous depolarization of the nodal tissue in the sa node occurs at ____________ action potentials per minute:

1 answer:

8 0

<span>It is 70-80 action potentials per minute. </span>The rate of phase 4 depolarization in the SA node sets the Heart rate, <span>The SA node serves as the Pacemaker</span> It has the greatest automaticity And ability to spontaneously generate an action potential.

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Describe the three main properties that scientists measure when they study populations

mars1129 [50]

Size, density, and growth rate are the three main ones. There is also dispersion, age structure, and survivorship. Hope this helps!

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3 years ago

Phylogenetic trees constructed from evidence from molecular systematics are based on similarities in _____.

hoa [83]

Answer:

mutations to homologous genetic loci

Explanation:

Phylogenetic tree, which is a diagrammatic representation of evolutionary relationship among organisms, can be constructed from evidence from molecular systematic with regard to the similarities in the mutations to homologous genes.

Homologous genes are genes that are inherited by two species from a common ancestor having similar DNA sequence. An example of homologous gene is Orthologous gene, which is said to have be brought about by speciation.

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3 years ago

The allele for round seeds is represented by R. Suppose that a pea inherited two recessive alleles for wrinkled seeds. How would

Brut [27]

For wrinkled seeds, it would be rr.

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3 years ago

what is the order of three genes (x, y, and z) that are located on the same chromosome, based on the following information? gene

Mekhanik [1.2K]

The recombination frequency between genes is useful to determine the distance between genes and their order in the chromosome. The correct order of genes in this chromosome is X-Z-Y.

<h3>What is the recombination frequency?</h3>

Recombination frequency refers to the probability of crossing-over events occurrence between two genes. There farther genes are from each other, the greater recombination frequency there will be.

Recombination frequencies are also used to determine the distance between genes, and if they are linked or not.

So, if we know the recombination frequencies, we can calculate the distances between the genes and figure the genes' order out.

The map unit is the distance between the pair of genes for which one of the 100 meiotic products results in a recombinant one.

1% of recombination frequency, RF = 1 Map Unit, MU = 1 centiMorgan, cM

Now let us analyze the data

Three genes ⇒ X, Y, Z.
Distance between X-Y = 17% = 17 MU
Distance between Y-Z = 9% = 9 MU
Distance between X-Z = 8% = 8 MU

When the RF is given, we already have the distance between genes.

Now, to put these genes in order, we need to look for the most distant genes. These are probably the ones placed at the extremes of the chromosomal fragment.

In this case, the most distant genes are X-Y. So,

---------X-----------------Y---------

17 MU

Then, we need to place the remaining genes, which are probably between the two extremes genes. To be sure of this position, the addition of these middle genes must equal the distance between the extreme genes.

In our example, we only have one remaining gene Z.

The distance from X to Z = 8 MU
The distance from Y to Z = 9 MU
9 MU + 8 MU = 17 MU which is the distance between X and Y (extreme genes)

-----------X-------------Z----------------------Y---------

║----8MU---║------- 9 MU -----║

║-------------17 MU ---------------║

So, according to this reasoning, the correct order of genes in this chromosome is X-Z-Y.

You can learn more about the recombination frequency at

brainly.com/question/13243739

brainly.com/question/20713958

brainly.com/question/11105396

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3 0

1 year ago

Which of the following organic compounds is the main source of energy for living things

pychu [463]

yes carbohydrate and fats are the main source of energy in all living things almost.

as we know plants store food in form of starch and animals in the form of glycogen both are carbohydrates. they can easily be formed and also broken down to give instant energy in the form of ATP.

Fats are another source which is used as a long term storage and used when there is a need of ATP in fast or starvation.

5 0

3 years ago

Read 2 more answers