How many unique haploid gametic genotypes could be produced through independent assortment by an organism with the diploid genotype AABbCCDdEe?
What will be an ideal response?
Answer: 8
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The rates of evolutionary change in DNA:
A. are highly variable among different gene families. B. are constant in gene families with a diversity of members. C. can only be determined in conserved genes. D. are constant among different gene families and thus are used to estimate the time of divergence. E. are zero.
The agouti gene, when expressed in mice, makes them obese, ravenous, yellow, and prone to diabetes. The agouti phenotype is dominant. During ovulation an agouti mouse is given a drug that methylates (or shuts off the agouti gene). She is then bred to another mouse and gives birth to a litter of baby mice, none of whom have the agouti phenotype. Which of the following is accurate?
A. An epigenetic change in the mother was passed to her offspring. B. Her offspring inherited the methylated form of the agouti gene. C. The agouti gene will be inactivated for the entire lives of her offspring. D. All of these are correct.
Rods and cones are located in the
a. lens. b. cornea. c. pupil. d. iris. e. retina.
What developmental event was key to the evolution of the chordates by forming the notochord and dorsal nerve cord?
A. Gastrulation B. Neurulation C. Morphogenesis D. Neural crest formation E. Organogenesis