BIO 198 Lecture Notes - Lecture 13: Sister Chromatids, Chromatid, Centromere
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15 Oct 2016
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A/a b/b crossed with a/a b/b to give f1 progeny of a/a. Will then make gametes in the following ratios: ab ab ab ab in 1 to 1 to 1 to 1 ratios. Ab and ab are the parentals and will see 50% that are parental chromosomes if genes assort independently. Whe(cid:374) they do(cid:374)"t assort i(cid:374)depe(cid:374)de(cid:374)tly: cross something to all recessive in the test cross. Pp/ll (purple, long) crossed with pp/ll (red, round): generate f1 progeny pp/ll and then self the f1 progeny and had an expectation that they would get a. They observed 4831 p_/l_, 1338 pp/ll and some of the phenotypes are over or underrepresented (393 pp/l_ and 390 p_/ll). When two genes line on the same chromosome and are linked: wm/wm white eyed, mini wing female crossed with wm/y males. F1 progeny: females are wm/wm wildtype and males are wm/y white eyed mini wing males.
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The syntenic genes A and Z are linked. A cross between two parents, AAzz and aaZZ, produces F1 progeny with the AaZz genotype. What are the possible arrangements of alleles on the F1 progeny's chromosomes?
A/Z or a/z |
Aa/Zz |
AZ/az |
AZ/Az or az/aZ |
Az/aZ |
The answer is not AZ/az
Genes that are on the same chromosome can assort independently when
Genes that are on the same chromosome can assort independently when
they are very close together on a chromosome and crossing over occurs rarely between the genes. |
they are far apart on a chromosome and crossing over occurs rarely between the genes. |
they are far apart on a chromosome and crossing over occurs frequently between the genes. |
they are syntenic. |
Genes on the same chromosome cannot assort independently. |
Please help me with these two!