Question

1. in drosophila a fly with a diploid complement of each autosome and a tetrasomic x chromosome number and one y chromosomes is a male

a. true

b. false

2. Eukaryotic genetic material in a less condensed state allowing for more gene expression is most likely

a. heterochromatin

b. satellite DNA

c. centromeric

d. euchromatin

e. a nucleosome

Answer 1

ANSWER :

In Drosophila, the sex determination depends on the specific ratio of female determinant (X-chromosome) and male determinant (autosomes), but not depend on the presence of Y-chromosome unlikely as in other organisms. A Drosophila fly with two sets autosomes (diploid complement) and one X-chromoseme are males (1X:2A), while a fly with diploid complement of autosomes (AA) and four X chromosomes (tetrasomic) would be a female and have a ratio of 2X:2A. Hence the corresponding statement is false.

2. The euchromatin are lossely packed chromosomes, which are less condensed state of genetic material and genetically more active to perform the gene expression. Hence option (d) is the correct answer.