D. Kidney and bladder are the 2 organs that are part of the excretory system.
Answer:. Nondisjunction during meiosis I in either the male and female gamete
The failure of homologous chromosome to separate at mitosis, or failure of sister chromatids to separate at Anaphase of meiosis I or ii is called non-disjunction.
In this cell division anomaly the unsegregated chromosomes are separated into cells as single chromosomes, therefore extra copies are therefore inherited.This result is one of the cell having an extra copies of chromosomes than others( chromosomes 21.
If this extra chromosome copies is segregated into a sperm or egg, the resulting zygote cells will have extra copy as chromosome 21, and hence Down syndrome.
→It is more common in Meiosis 1 than ii,because of longer duration of the first stage of division than meiosis ii,given rooms to errors.
→Most common in women(with age increase) than men because of exchange of telomeres in them,which worsen with age. Their Meiotic mechanism which weaken with age, and more prone to errors compare to men,
Explanation:
Answer:
is revealed by the degree of similarity in sections of their DNA
Explanation:
phylogenetic analysis of DNA sequences of two different species are compared and the level of similarity between nucleotide sequences in DNA help to identify their relatedness.
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The correct answer is: [A]:
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"<span>all the members of a species that live in a defined geographic region at the same time."
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