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Which of the following results when homologous chromosomes cross over in meiosis?  

In eukaryotes which of the following is the first step in translation?  

Radish flowers may be red, purple, or white. A cross between a red-flowered plant and a white-flowered plant yields all-purple offspring. The flower color trait in radishes is an example of which of the following inheritance patterns?  

Independent assortment of chromosomes is a result of which of the following processes?  

A student isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule consists of a normal strand paired with numerous segments of DNA a few hundred nucleotides long. What has she probably left out of the mixture?  

Which of the following is most likely to result if a cell is unable to produce histone proteins?  

What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized?  

Which of the following relationships among alleles of a single gene best explains the observation that a single change in the gene encoding α-keratin results in chickens with frizzled feathers, increased food consumption, higher heart rate and delayed sexual maturity?  

A sample of double-stranded DNA contains 42% cytosine. Approximately what percent of the nucleotides in this sample will be thymine?  

During which of the following processes does independent assortment of chromosomes occur?