Two Drosophila are crossed several times, with a total number of offspring of 106 females and 48
males. There is too great a deviation from the expected 1:1 ratio for chance alone to account for the
difference. What other factor could account for this difference? What will be an ideal response?
a sex-linked recessive lethal gene expressed in the males, who received it from their mothers
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What are the three strategies for defending against foreign organisms, cells, or molecules?
What will be an ideal response?
HIV stands for human ________ virus
Fill in the blank(s) with correct word
Which of the following best describes a biome?
A) three different classes of ecosystems based on high, medium, or low rainfall B) three different classes of ecosystems based high, medium, or low temperature C) small terrestrial regions with similar climate and the similar communities of organisms D) large terrestrial regions with similar climate and similar types of plant life
Base pairs in DNA are held together by _____ bonds.
A) Hydrogen B) Sulfhydryl C) Peptide D) Polar covalent E) Nonpolar covalent