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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?  

Genetic variation leads to genetic diversity in populations and is the raw material for evolution. Which of the following statements best represents the connection between reproduction and evolution?  

Hershey and Chase set out to determine which type of molecule is used for genetic inheritance. They completed a series of experiments where E. coli was infected by a T2 virus. Which molecular component of the T2 virus ended up inside the cell?  

Which component is directly involved in translation?  

Which of the following changes in an exon is most likely to result in a nonfunctional protein product?  

Which of the following statements correctly explains the fact that all seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment?  

Which of the following statements describes a major difference between meiosis II and mitosis in a diploid animal?  

During which of the following processes do homologous pairs of chromosomes align adjacent to one another at the metaphase plate of a cell?