Drosophila fruit flies, like mammals, have an X-Y sex-determination system. The insect differs from the mammalian system in an important respect, however. What is it?
What will be an ideal response?
While Drosophila has X-Y sex determination, where XX individuals are female and XY individuals are male, studies have shown that sex determination is based on the ratio of X chromosomes to autosomes rather than on Y-linked genes. Thus, XO Drosophila develop as males and XXY Drosophila develop as females–the same X : autosome ratio as XY and XX individuals.
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"Gain of function" mutations are generally dominant because one copy in a diploid organism is sufficient to alter the normal phenotype
Indicate whether the statement is true or false
Short actin filaments bind to tetramers of which protein to form the cytoskeleton of erythrocytes?
a. Myosin b. alpha-actinin c. Spectrin d. Ankyrin e. Arp2/3
When water ionizes, it produces equal amounts of hydrogen and hydroxide ions that can reassociate with each other. The pH of water is: 5-9-2013
A. 3 B. 4 C. 5 D. 6 E. 7
The peptide hormone ________ regulates the kidney's retention of water.
What will be an ideal response?