In humans, if nondisjunction led to an individual with a genotype of XXY, that person would
A. display both male and female characteristics.
B. be male because each cell has one Y chromosome.
C. be female because each cell has two X chromosomes.
D. not survive.
Answer: B
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Genome screening with molecular markers is a useful model for studying the genetics of
homosexuality. Indicate whether the statement is true or false.
How are the chromosomes of a eukaryote cell replicated?
a. The linear DNA molecules are replicated from multiple origins of replication bidirectionally. b. The linear DNA molecules are replicated from one origin of replication bidirectionally. c. The circular DNA molecules are replicated from multiple origins of replication bidirectionally. d. The circular DNA molecules are replicated from one origin of replication bidirectionally. e. The linear DNA molecules are replicated from one origin of replication unidirectionally.
Which of the following is the best definition of mycelium?
a. an association between a fungus and a plant root b. a mass of hyphae c. a mushroom d. a fungal cell
Choose the true statement about foreign DNA in the human genome.
A. Most of the foreign DNA in the human genome is coding DNA. B. New foreign DNA is regularly entering the human genome. C. Most of the foreign DNA in the human genome is ancient. D. Like the Drosophila genome, the human genome is constantly eliminating its foreign DNA.