Expert Q&A; Done 22. X-ray diffraction data showed that the spacing between repe

Question

Expert Q&A; Done 22. X-ray diffraction data showed that the spacing between repeating units (nucleotides) along the axis of the DNA helix bs A) 2.0 angstroms B) 3.4 angstroms C) 20 angstroms D) 34 angstroms E) None of these are correct 23. A normal eukaryotic chromosome contains all but which of the following features? A) 1 centromere B) 8 telomeres C) 9 histone polypeptides per nucleosome D) euchromatin E) heterochromatin 24. The genetic map location of the human MLH1 gene is given as 3p222. This notation means that (circle all that apply) A) the gene is on the long arm of a chromosome B) the gene is on the short arm of a chromosome C) the gene is on chromosome 3 D) the gene is on chromosome 21 E) the gene is present in three copies on chromosome 21 Other questions- answer as indicated. To recelve partial credit, you will need to show your work where approprlate 25. What is a simple definition of an allele? 26. Name two eukaryotic cellular organelles containing genetic material, other than the nucleus and 27. The housefly, Musca domestica, produces gametes with a haploid chromosome number of 6. How many chromatids would be present in a diploid, somatic cell of the fly as it is entering mitosis?

Explanation / Answer

Answer 22:

The distance between two nucleotides in a DNA is 3.4nm.

This is equal to 34angstrom.

Ans 23: (B) 8 telomeres.

In reality, an eukaryotic chromosome has 4 telomeres.

D. 34angstroms

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