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mina [271]
3 years ago
14

On average, what percentage of infants born to 45-year-old mothers have down syndrome

Biology
1 answer:
insens350 [35]3 years ago
6 0
Probably 3 %. a mother could give birth to a child with Trisomy 21 at any age because Trisomy 21 is a mutation and mutations happen all the time. Not all mutations are as Down Syndrome. A child born to two homozygous brown eyed parents could be born with blue eyes even if no one in the family had blue eyes. The child would develop blue eyes due to mutation.

Write in on google this same exact question and you'll find other questions too in quizlet that have answers
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It is imperative that the cells of the heart beat simultaneously in order to be effective, so the cells are connected by _______
timofeeve [1]
Myocardial conduction cells are connected by cardiac muscle tissues
6 0
2 years ago
18.
bagirrra123 [75]

The correct answer is rapids and waterfalls.  

Rapids refers to the segments of streams with extensively vigorous currents, various obstacles, and steps in their streambeds. A waterfall refers to a vertical drop in a stream bed. Both are the locations of vigorous erosion.  

The rapids are generally produced where the resilient bedrock limits a stream to a narrow channel and forces an enhancement in the velocity of water.  

On the other hand, waterfalls are produced where the fast-flowing water negotiates a geologic contact amid the more resilient and less resistant layers of rock, or through a fault, which has analogized distinct kinds of rocks. Or it can be said that waterfalls usually produce at the end of a series of rapids.  


3 0
3 years ago
Read 2 more answers
In two or more complete sentences describe how a dam placed in a river can act as both a constructive and destructive force.
FromTheMoon [43]
The good thing about a dam is that electricity can be created by mechanical means. That does not affect the atmosphere. Storing such production is a different matter.

The bad thing about a dam is that it wreaks havoc on the land where the water is stored behind the dam.

8 0
3 years ago
Read 2 more answers
Causes water molecules to rise up from the roots eventually reaching the leaves?
torisob [31]

Answer:

✔ Xylem ** is the correct answer

Explanation:

Xylem is the water transporting tissue in plants

4 0
3 years ago
If an electric train moves south, which direction does the train smoke go?
Gala2k [10]

no direction

because its electric so there is no smoke produced

if someone is smoking the it will move in south direction xD

3 0
2 years ago
Read 2 more answers
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