Which of the following statements about genes and alleles are true?1. Qualitative traits are each determined by a single gene that has a small number of alleles2. When a gene has 2 alleles, the allele frequency in a population move toward equilibrium values for 0.5 for each allele3. All else being equal, alleles associated with higher reproductive success decrease in frequency4. If the frequency of an allele in a population has changed over generations, then evolution has occured

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ans.

in united states (us), the first leading cause of death for both women and men is heart diseases that leads to more than half of the deaths. heart diseases develop due to narrow arteries, buildup of plaque in blood capillaries that arises difficulties in blood flow.

the second leading cause of deaths in us is cancer that affects individuals of all ages. it develops due to uncontrolled growth and spread of tumor cells, which results in death if the not controlled or treated.

the third leading cause of deaths in us is copd or chronic obstructive pulmonary disease. it includes difficulty in breathing, chest infections, and persistent cough. smocking is a leading cause of copd and around 80% of copd deaths occur due to smoking.

thus, the correct answer is 'option). cancer, copd, and heart disease.'