Autosomal recessive traits
a) occur in one-quarter of all offspring
b) can skip generations
c) are exhibited only in the offspring of two heterozygous parents
d) occur more frequently in females than males
e) all of the above answer choices are correct
Answer: b) can skip generations
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A pear plant with the genotype Aa can produce gametes containing:a
either A or Aa. b. only the dominant A. c. only the recessive a. d. either A or a. e. either AA, Aa, or aa.
Weightlifters, bodybuilders, and other athletes who require rapid bursts of high-energy muscle output often spend a lot of money on dietary supplements
Some supplements, such as amino acids, are used as building blocks to make more high-protein muscle cells. Other supplements increase energy or provide more endurance during workouts. For example, supplements that contain creatine (often sold as creatine diphosphate) are reputed to provide more energy. Based on this information and your knowledge of muscle physiology, would you expect creatine supplements to provide extra energy? Why or why not? A) No, because the digestive system breaks creatine (a large protein macromolecule) down before it can be used by the body. B) Yes, because creatine is used directly as a source of energy by muscle cells. C) No, because creatine is not used for energy production in the body. D) Yes, because the creatine supplement can donate phosphate ions to regenerate ATP.
A farmer in Mississippi presents with a chronic cough.Chest radiograph reveals an opaque mass. Biopsy of the lung shows macrophages with multiple yeast forms (see enclosed picture).Which one of the following diagnoses is most likely?
A. Coccidioidomycosis B. Sporotrichosis C. Blastomycosis D. Histoplasmosis E. Paracoccidioidomycosis
Fossil and genetic evidence strongly supports the idea that modern humans
A) independently arose from three different ancestral Homo species in Africa and Eurasia. B) all derive from a single African lineage that spread from there into other parts of the world starting about 50,000 years ago. C) derive from an African lineage but also have genes derived from mixing with several Eurasian descendants of Homo erectus. D) derive from Neanderthals that independently evolved the features of modern humans in Europe and Africa.