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

Biology & Microbiology

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What are the three strategies for defending against foreign organisms, cells, or molecules?

What will be an ideal response?

Biology & Microbiology

HIV stands for human ________ virus

Fill in the blank(s) with correct word

Biology & Microbiology

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

Biology & Microbiology

Base pairs in DNA are held together by _____ bonds.

A) Hydrogen B) Sulfhydryl C) Peptide D) Polar covalent E) Nonpolar covalent

Biology & Microbiology