A eukaryotic DNA sequence that activates transcription at distant promoters is called a(n)

In the cells of all human females, one X chromosome is inactivated. The opsin1 gene is on the X chromosome and it is transcribed in the retinal cells of the eye. Loss-of-function mutations in this gene cause the recessive trait of color blindness. Most women who have one mutant allele of the opsin1 gene and one normal allele of the opsin1 gene (heterozygotes) can still see color. What is the most likely explanation for this finding?

An inherited disease that affects human XX females and not XY males can be caused by:

Pericentric inversion results in an acentric (without centromere) fragment that is lost during meiosis.

An isolated population of prairie dogs has longer than average teeth. As a result, they can eat more grass with less effort and are better able to survive. The mutation(s) that resulted in longer teeth:

Which of the following statements about CpG islands is correct?

Cystic fibrosis in humans is caused by mutations in a single gene and is inherited as an autosomal recessive trait. A couple where neither has cystic fibrosis has two children. The first child has cystic fibrosis, and the second child is unaffected. What is the probability that the second child is a carrier (heterozygous) for the mutation that causes the disease?

Why are BRCA2− BRCA2+ heterozygotes are more likely than typical (BRCA2+ BRCA2+) individuals to develop breast and ovarian cancer?

Epigenetic changes refer to changes in gene function that are stable due to changes in DNA sequence.

How do you get bonus points in the course?