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Author Question: Normal diploid somatic (body) cells of the mosquito Culex pipiens contain six chromosomes. Assign ... (Read 72 times)

vicky

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on: Mar 26, 2020
Normal diploid somatic (body) cells of the mosquito Culex pipiens contain six chromosomes. Assign the symbols AmAp, BmBp, and CmCp to the three homologous chromosomal pairs. The "m" superscript indicates that the homolog is maternally derived; the "p" indicates a paternally derived homolog. Assume that in the genus Culex, the sex chromosomes are morphologically identical.

(a) For each of the cell types given below, draw and label (with reference to the symbols defined above) an expected chromosomal configuration.

mitotic metaphase
metaphase of meiosis I
metaphase of meiosis II

(b) The stage at which "sister chromatids go to opposite poles" immediately follows which of the stages listed in (a)?

(c) Assuming that all nuclear DNA is restricted to chromosomes and that the amount of nuclear DNA essentially doubles during the S phase of interphase, how much nuclear DNA would be present in each cell listed in part (a)? Note: Assume that the G1 nucleus of a mosquito cell contains 3.0 × 10-12 grams of DNA.

(d) Given that the sex of Culex is determined by alleles of one gene-males heterozygous, Mm, and females homozygous, mm–illustrate a labeled chromosomal configuration (involving the symbols AmAp, BmBp, and CmCp and the M locus) in a primary spermatocyte at metaphase. Assume that the M locus is on the AmAp chromosome and that crossing over has not occurred between the M locus and the centromere.
Essentials of Genetics ¦ Klug ¦ 9th Edition
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Marked as best answer by vicky on Mar 26, 2020

jaygar71

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Reply #1 on: Mar 26, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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vicky

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Reply 2 on: Mar 26, 2020
Gracias!

irishcancer18

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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