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Dmitriy789 [7]
3 years ago
14

Although in humans there are 22 pairs of autosomal chromosomes, only three different chromosomal trisomies are commonly seen in

newborns. Of the remaining 19 autosomes, many trisomies have not been seen in newborns. Why not?
Biology
1 answer:
Eddi Din [679]3 years ago
3 0

Answer:

The reason why only 3 out of the 22 possible autosomal trisomies are seen in newborns, is because the rest of them are chromosomal abnormalities not compatible with life and thus an spontaneous abortion occurs. The embryos suffering from these trisomies do not survive for more than a few weeks in the uterus, so the miscarriage often goes unnoticed for the mother as she may not have realized she was pregnant.

The only trisomies that are allow fetuses to be born are: Patau Syndrome (trisomy 13), Edwards Syndrome (trisomy 18), and Down Syndrome (trisomy 21). Out of these three, people with Down Syndrome have the largest life expectancy.

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A decrease in the autonomic tone of the smooth muscle in a blood vessel would result in:.
Mrac [35]

A decrease in the autonomic tone of the smooth muscle in a blood vessel would result in an increase in blood flow through the vessel.

<h3>Meaning of smooth muscle</h3>

smooth muscle can be defined as a muscle in the body that is non striated and involuntary in nature.

Smooth muscles are mostly found in hollow organs, passageways and tracts of some systems.

In conclusion, A decrease in the autonomic tone of the smooth muscle in a blood vessel would result in an increase in blood flow through the vessel.

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3 0
2 years ago
What is the volume of 0.25 mol of ammonia gas at 1.00 atm and 273 K? (R= 0.0821 Latm/molK)What is the volume of 0.25 mol of ammo
ICE Princess25 [194]

Answer:

5.6L

Explanation:

Given parameters:

number of moles  = 0.25mol

pressure on gas  = 1atm

temperature  = 273K

Gas constant R = 0.0821Latm/molK

Unknown:

Volume of gas  = ?

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It is mathematically expressed as;

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          R is the gas constant

          T is the temperature

          n is the number of moles

All the parameters are in the appropriate units and we simply solve for the volume of the gas;

                1 x V = 0.25 x 0.0821 x 273

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