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14 Cards in this Set
- Front
- Back
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In a mammal how many inactivated X chromosomes (Barr bodies) would be present in cells of individuals who were XXX? |
2 |
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In a mammal how many inactivated X chromosomes (Barr bodies) would be present in cells of individuals who were XXXY? |
2 |
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In an autotetraploid the genes A/a and B/b are closely linked on either side of the centromere. If a plant of the constitution A B / A B / a b / a b is selfed, and the chromosomes pair as bivalents, what proportion of progeny will be a b / a b / a b / a b? |
1/36 |
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In a tetraploid of genotype A/A/a/a, the A locus is close to the centromere and the chromosomes pair as bivalents. What proportion of gametes will be A/a? |
2/3 |
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When an allotetraploid is backcrossed to one of its progenitor species, a sterile progeny is produced. This sterile individual can be best represented by |
2n1 + n2 |
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The chromosome constitution of an allotetraploid can be represented by |
2n1 + 2n2 |
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In a triploid of genotype B/b/b, what proportion of gametes will be B? |
1/6 |
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A wild-type chromosome can be represented as ABC • DEFGH, and from this a chromosomal aberration arises that can be represented ABC • DEGFH. (Note: the “dot” denotes the centromere.) This is known as |
paracentric inversion |
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What is the chromosome aberration of the type ABCD • EFFGH called? (Note: the “dot” denotes the centromere.) |
Duplication |
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A human mosaic was discovered of type XXXY/XY. This individual probably arose by |
mitotic nondisjunction in a Klinefelter zygote |
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A couple has a phenotypically normal son who, upon inspection of his sex chromosomes, is found to be XYY. In what parent, and in what meiotic division, could the nondisjunction causing this constitution have happened? |
Father, second meiotic division |
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In corn, root tip cell nuclei normally have 2n = 20 chromosomes. How many chromosomes would be typical of root tip cell nuclei in (a) a monosomic. (b) a trisomic. (c) a monoploid. (d) a triploid. (e) an autotetraploid. |
a. 19 b. 21 c. 10 d. 30 e. 40 |
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Monosomy |
(2n-1) Turners Syndrome |
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Trisomy |
(2n+1) XXY- Klinefelters Syndrome Trisomy 21- Down Syndrome |
