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izquierdohannah
10.04.2020 •
Biology
Which of the following answer choices best explains a mechanism as to how Down syndrome might occur?
Choose 1 answer.
Homologous chromosomes fail to separate at chromosome 21 during anaphase II in a parent's
gamete.
Sister chromatids fail to separate at chromosome 21 during anaphase II in a parent's gamete.
©
Crossing over doesn't occur during prophase I in a parent's gamete.
Sister chromatids fail to separate at chromosome 21 during anaphase I in a parent's gamete.
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Ответ:
The resting membrane potential of a neuron is about -70 mV (mV=millivolt) - this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron
Explanation: