How do genetic mosaics help determine the focus of action of a gene?
A) Mosaics are composed of cells with different genotypes, so the phenotype of the cells that lack a gene product can be compared to that of neighboring cells that have the gene product.
B) Mosaics are created by mating flies that are homozygous recessive for two different genes and the morphology of the double mutant progeny is studied.
C) Mosaics are created by mating two flies that carry homozygous gain-of-function mutations in different genes and the effects of the mutations on the morphology studied.
D) Mosaics are created by the Cre-loxP system which allows for the deletion of specific genes at controlled stages of development.
A) Mosaics are composed of cells with different genotypes, so the phenotype of the cells that lack a gene product can be compared to that of neighboring cells that have the gene product.
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Which of the following represent limitations on a cheetah's ability to be an effective predator? (Select all correct choices.)
A. They must rest for long periods between sprints. B. They cannot run when the temperature reaches around 105oF. C. They cannot successfully prey on goats, which can release excess heat as they run. D. They have a top speed significantly lower than that of most of their desired prey.
The frustule of diatoms is made of:
a. cellulose. b. calcium carbonate. c. silica. d. protein. e. starch.
As of 2014, a new clinical study in the United States is testing whether cells derived from IPSCs can reverse ____
a. spinal cord injuries b. Parkinson's disease c. muscular dystrophy d. heart attacks e. blindness
Which of the following is true of monocot leaves?
a. Many monocots have a distinct palisade layer. b. Many monocots lack a petiole. c. Many monocots have a distinct spongy layer. d. Many monocot leaves are broad. e. Many monocot leaves have netted venation.