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ELEN [110]
3 years ago
6

When a child is born with down syndrome, when did the mutation occur?

Biology
2 answers:
DerKrebs [107]3 years ago
8 0
It occurred during meiosis.
Varvara68 [4.7K]3 years ago
5 0
It occurred doing meiosis, as when the gametes were combining a third chromosome was added to the 21st pair and caused Trisomy 21 Sydnrome, or as we know it, Down’s Syndrome.
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If a boy exhibits a sex-linked trait that is carried on the X chromosome, what must be true?
ad-work [718]

Answer;

C. His mother carried at least one allele for that trait

Explanation;

-Men have a single allele of each gene on the X chromosome, inherited from their mother, and a single allele of each gene on the Y chromosome, from their father.

-A sex-linked trait is a trait that is controlled by a gene or an allele located on the sex chromosome.

-X-linked traits are maternally inherited from carrier mothers or from an affected father. Each son born to a carrier mother has a 50% probability of inheriting the X-chromosome carrying the mutant allele.

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3 years ago
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How does earths magnetic field provide evidence for seafloor spreading
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Answer:

Magnetic reversal proves seafloor spreading because we can see the polarity of the Earth's magnetic field in rocks. As magma cools, particles in it get “frozen” in the direction of the magnetic field. ... The magnetic evidence shows that the oldest rocks are far away from the ridge and the newest rocks are closest.

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3 years ago
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Osteoporosis is more prevalent among women than men because women generally
MrRa [10]

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Explanation: Becouse i think thats it

5 0
3 years ago
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Why do some leaves turn from green to red, orange, or yellow in the fall?
11111nata11111 [884]

Answer:

Chlorophyll Breaks Down

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because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible

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7 0
2 years ago
Which sequence shows the correct order of living things in a food chain?
kkurt [141]

The correct answer is option (A) leaves > deer > wolf.

A food chain is a linear sequence of organisms through which the nutrients and energy flow as one organisms feeds on the other. They show organisms starting from the producers and end with consumers or sometimes with detrivores or decomposers. Each level of the food chain is called the trophic level. The producers which use solar energy and prepare their food occupy the first trophic level, followed by the primary, secondary, tertiary, quaternary consumers occupying the next trophic level.

In the food chain given above, leaves > deer > wolf, deers feed on the leaves which are maximum in number comparitively, wolf feeds on the deer which are comparitively more in number than the wolves. This is the correct sequence of food chain showing the tranfer of energy and decreasing number of organisms with subsequent increase in the trophic levels.

8 0
3 years ago
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