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

1 answer:

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.

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Natural selection is based on Darwin’s observation that individuals most likely to survive and reproduce are those _____.

mariarad [96]

Answer:

Explanation:

Natural selection is based on Darwin’s observation that individuals most likely to survive and reproduce are those with traits best suited to their current environment.

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3 years ago

A mutation can be passed on to offspring if it occurs in the

aalyn [17]

I believe the correct answer is chromosome.

<h2>Explanation:</h2>

We inherit 23 chromosomes from our mother and another 23 chromosome pairs from our father. You have to inherit a defective chromosome for you to get the mutation. This is what is called germ line mutation usually carried in the sperm or ovum. Of the 23 chromosomes, 22 are autosomal and 1 is chromosomal meaning of the 23 one of them is X and another one is . You get the Y from your father and the X from your mother.

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Considering the experimental design, which claim is best supported using the data?

VLD [36.1K]

Answer:

C low competition for glucose

Explanation:

From the given answer choices and information,

It cannot be A since there is no visual disease or any indication of disease in the experiment

Cannot be B, since space would not be an issue since it clearly hit 111 on day 3

and cannot be D since there is no indication of a change in temperature.

However, we know Petri Dishes have nutrients to stimulate cell growth, and those resources are not unlimited therefore we can only attest that a large portion of the nutrients have been consumed and starved some of the cells thus causing a population decrease

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3 years ago

Compare how ectotherms and endothermic maintain body temperature

shepuryov [24]

Answer: Ectotherms depend on external heat sources. Their body temperature changes with the temperature of the environment. Endotherms generated heat internally to maintain body temperature.

Explanation:

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According to the passage, which of the following topics of study was the most crucial to his final analysis?

TEA [102]

Answer: The study of plant varieties.

Explanation:

This question relates to the studies that Gregor Mendel, founder of modern genetics, performed at the University of Vienna.

Experimenting on pea plants, Gregor Mendel was able to establish a lot of the rules of heredity that we know today even though his research was not fully appreciated or understood during his own life.

He credited the study of plant varieties to have been most crucial to his final analysis because farmers had been crossbreeding varieties for millennia to bring about better traits in plants.

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