Biology, 29.03.2020 23:20 makmcduffie2924

Which additional chromosomes is associated with having down syndrome

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The additional chromosome related to Down syndrome is chromosome 21, which is the product of an error in meiotic division.

Explanation:

Down syndrome is a genetic alteration that produces morphological and functional changes in individuals who have it, including the mongoloid facies. It is a condition called chromosome 21 trisomy.

Each gamete must contain the exact half of the chromosomes of a species, with each human chromosome having 23 chromosomes (n = 23). For this to occur, the sister chromatids must separate properly during meiosis division.

An error in meiosis, called non-disjunction, causes a gamete to contain an extra chromosome (n = 23 + 1), as the sister chromatids do not separate. This gamete, when joined to a normal gamete, produces a trisomy in the affected chromosome, being the trisomy of chromosome 21 the one that causes Down syndrome.

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Trisomy 21 link

Answer from: Quest

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )

Answer from: Quest

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

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Which additional chromosomes is associated with having down syndrome...