In garden peas, one pair of alleles controls the height of the plant, and a second pair of alleles controls flower color
The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for
white (p). A tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/2 tall with purple
flowers and 1/2 tall with white flowers. What is the genotype of the parents? What will be an ideal response?
ANSWER: DD Pp x dd pp
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A student complains that it makes no sense to worry about coliform bacteria in water, since we naturally possess harmless coliforms in our intestines anyway. Why do regulatory agencies worry about coliform bacteria in water supplies, then?
A. The coliforms in our intestines can sometimes turn harmful, causing intestinal infections. We need to constantly be on guard against this happening. Coliforms in water might add to this potential problem. B. Not all coliforms are harmless and symbiotic with human beings. Some may carry genes/proteins that can make them dangerous to humans. It's best to keep coliforms OUT of our drinking water, since it's difficult to identify which ones might be harmless and which ones might be harmful. C. Regulatory agencies are worried that multiple types of coliforms in water might lead to greater antibiotic resistance in the bacterial populations. They try to keep them out of water to keep antibiotic resistance levels down. D. Regulatory agencies simply need something to do to justify their existence. There is no real danger from coliforms in water supplies.
The Florida panther, Puma concolor coryi, is one of the most threatened species on Earth, with only 80-00 individuals remaining. Their population is most threatened by humans, habitat loss, and their own poor health due to genetic diseases. Some conservationists want to introduce new individuals from Texas, the mountain lion, Puma concolor. Scientists are currently uncertain whether the Florida panther and the Texas mountain lion are the same or different subspecies.Many areas in Florida are set aside as preserved lands, especially in the Florida Everglades National Park, National Forests, and numerous state parks. However, these areas are fragmented and often bisected by large highways. One strategy to preserve biodiversity in Florida has been to create tunnels at intervals
underneath the highways. What functions do these tunnels serve? A. Minimize edge effects B. Create a single large reserve C. Provide movement corridors D. Create a flagship species E. Simulate island biogeography
A(n) _____ is an individual animal that possesses both male and female sex organs.
A. larva B. cephalopod C. hermaphrodite D. deuterostome E. acoelomate
The atomic number of hydrogen is 1. Based on this fact, all of the following must be true of hydrogen gas (H2 ) EXCEPT that it
A) is a stable molecule. B) shares one pair of electrons between the two hydrogen atoms. C) is a polar molecule. D) uses covalent bonds to form the molecule.