The genotypic definition of race states that races are populations of the same species in which allele frequencies differ by ____
a. 15%-20%
b. 85%
c. 1 in 1000 nucleotides
d. 25%-30%
e. 5%-10%
d
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Which of the following statements best describes characteristics of Platyhelminthes?
A. They are acoelomate. B. They are triploblastic. C. They have an incomplete digestive system. D. They respire by diffusion of gases through the body wall. E. All the choices provided are true.
What is the function of villi and microvilli in the small intestine?
What will be an ideal response?
Which statement is true?
a. Chromatin remodeling changes the order of genes between histones. b. Chromatin remodeling becomes permanent when inherited. c. DNA methylation and chromatin remodeling can cause cancer. d. DNA methylation and chromatin remodeling are independent processes.
Johann Gregor Mendel’s work in genetics focused on traits that exhibit discontinuous variation. What kind of traits are these?
a. traits that are inherited in distinct patterns easily distinguishable among phenotypes b. traits that are controlled by many genes that each participate in subtle ways to produce a range of phenotypes c. traits that are controlled by individual genes that are “tempered” by neighboring genes to produce a range of phenotypes d. traits that are located physically close to each other on the same chromosome