In the P-M system of hybrid dysgenesis in Drosophila, what is responsible for the infertility of offspring of the P male × M female cross?
What will be an ideal response?
Ans: The P male's chromosomes introduce P elements into the offspring genomes. Their subsequent transposition causes insertions into multiple genes, inactivating them and resulting in sterility and other abnormal traits.
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Which of the following statements about complex multicellular organisms is false?
A. Complex multicellular organisms and simpler multicellular organisms perform a similar range of ecological functions. B. Regulatory genes guide the development of complex multicellular organisms. C. Large differences in the body forms of complex organisms result from different patterns of gene expression. D. When compared to their simpler phylogenetic relatives, complex multicellular organisms show greater species diversity. E. None of these statements about complex multicellular organisms are false.
During which meiotic phases does oogenesis arrest?
A. prophase I and metaphase II B. prophase I and prophase II C. metaphase I and prophase II D. metaphase I and metaphase II E. metaphase I and anaphase II
During oogenesis, cells divide unequally into a large functional oocyte and a small
____________________. Fill in the blank(s) with the appropriate word(s).
In gram-negative bacteria, which secretion systems depend on Sec or Tat to first move proteins across the inner membrane?
a. types II and V b. types I and II c. types II and IV d. types V and VI