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in particular plant species, 2n = 12. how many chromosomes will an allotetraploid individual have?

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Each somatic cell in an individual with Down syndrome contains _____ chromosomes. a) 47 b) 46 c) 24 d) 45

Although in humans there are 22 pairs of autosomal chromosomes, only three different chromosomal trisomies are commonly seen in newborns. Of the remaining 19 autosomes, many trisomies have not been seen in newborns. Why not?Although in humans there are 22 pairs of autosomal chromosomes, only three different chromosomal trisomies are commonly seen in newborns. Of the remaining 19 autosomes, many trisomies have not been seen in newborns. Why not? a) Trisomy for the other autosomal chromosomes is often lethal, and the affected embryos are miscarried. b) These autosomal chromosomes do not contain the same type of DNA or protein that makes up chromosomes susceptible to trisomy. c) Trisomy for these other autosomal chromosomes occurs so rarely that it has never been documented. d) Trisomy for these autosomal chromosomes has no effect and therefore would never be noticed.

In theory, when a nondisjunction for chromosome 18 occurs during meiosis I, four gametes can be produced. If these gametes are fertilized with unaffected gametes from the second parent, what observations would you make concerning the resulting embryos? a) Two of the embryos will be trisomic for chromosome 18, and two will contain a single copy of chromosome 18. b) All four possible embryos will be trisomic for chromosome 18. c) Two of the embryos will be trisomic for chromosome 18, and two will be normal. d) Two of the embryos will be normal, and two will contain a single copy of chromosome 18.

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