A human somatic cell usually contains twenty-three pairs of chromosomes. Only one of these pairs will be a pair of sex chromosomes. The genetic composition of a male child is twenty-two pairs of autosomes- any chromosome that is not involved in sex determination - and one pair of sex chromosome (XY). This can be represented as 22-XY.
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Nondisjunction Produces Abnormal Gametes. If nondisjunction occurs during anaphase I of meiosis I, this means that <u>at least one pair of homologous chromosomes did not separate.</u> The end result is two cells that have an extra copy of one chromosome and two cells that are missing that chromosome. Click to see full answer.
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SEA SQUIRT
SEA GRASS
PELICAN
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A) because if you look at the chart, the numbers on the right increase then decrease when it hits 19:00.
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The answer is B
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New species often form on new islands because they evolve to fill new niches