Imagine there is a breed of dog in which having a tail is dominant and having no tail is recessive. If two dogs that are heterozygous for this trait mate, what proportion of their offspring will have no tail?

Which of the following hormones act on the distal convoluted tubule to facilitate sodium reabsorption and potassium excretion?

__________ is a hydrolytic enzyme that catabolized starch into maltose.

Which of the following events occur during anaphase?

In pea plants, one chromosome houses the gene for round (R) or wrinkled seeds and a different chromosome houses the gene for yellow (Y) or green seeds. What are the gametes that an individual could produce if their genotype were RrYy?

If a person is heterozygous for a particular gene, it means that…

Humans can’t digest cellulose, a component of plants, very well. Imagine you developed a mutation in one of your stomach cells and it allowed your cell to start producing cellulase, an enzyme that breaks down cellulose. Every time that cell divides, the mutation is spread to another cell in your stomach and that cell can produce cellulase too. Soon, you can start getting more energy from salads than other people, because you can break down the cellulose.   Which of the following terms describe this type of mutation? Select all correct answers.

Which image is correctly labeled? Image A Image B (below) Image C (below) Image D (below)

If the diploid chromosome number for a species was 4 (as in 4 total chromosomes), how many chromatids would there be in prophase of mitosis? 

What is the difference between purines and pyrimidines?