Which is a transgenic organism?
A) a fern grown from a single fern root cell
B) a rat that has had rabbit hemoglobin genes added to its genome
C) a cow that has been fed pig growth hormone in its food
D) a human given a corrected human blood-clotting gene
Answer: B
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What methods do fungi employ to disperse their spores? Select all correct choices
A. They can instruct plants to form "fake flowers," which attract pollinators that then disperse spores. B. They can produce pheromones similar to those of boars, which attract sows that disperse the spores. C. They can form fruiting bodies, which expel spores above "stagnant" air. D. They can highjack ants, creating "zombie ants" that (after death) disperse spores.
Natural selection results in organisms perfectly adapted to their environments
Indicate whether the statement is true or false.
Which of the following is NOT promoted by the
active form of phytochrome? a. seed germination b. root growth c. leaf expansion d. stem branching e. none of these
Humans have a gene, T, that is involved in muscle formation of the tongue. Individuals homozygous for one allele can roll their tongues, while individuals homozygous for the other allele cannot
If both parents can roll their tongues, but their child cannot, what can be said about the mode of inheritance? A) Tongue rolling is dominant. B) Tongue rolling is recessive. C) The parents were both homozygous, but the child was heterozygous. D) Tongue rolling is dominant, and both parents were heterozygous (Tt). E) Tongue rolling is recessive, and both parents were heterozygous (Tt).