Viruses
A. consist of only a single cell.
B. consist of multiple cells.
C. contain ribosomes.
D. contain a nucleus.
E. are smaller than cells.
Answer: E. are smaller than cells.
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You are a genetic counselor, and a couple comes to you with concerns that if they have a child
together it could have hemophilia. Neither one of them has hemophilia, but the woman's biological father did have an X-linked recessive form of hemophilia. Which of the following would be a correct thing to tell them?
a. Any child that they produce will have a 50% chance of having hemophilia. b. All of their male offspring will have hemophilia, and each of their female offspring will have a 50% chance of having hemophilia. c. None of their offspring should have hemophilia, but all of their female offspring will be carriers for hemophilia. d. Each of their male offspring will have a 50% chance of having hemophilia, and while their female offspring should not have hemophilia, they will each have a 50% chance of being carriers. e. All of their male offspring will have hemophilia, and while their female offspring should not have hemophilia, they will all be carriers.
Double fertilization occurs when
a. one sperm unites with an egg and another sperm unites with the central cell of the female gametophyte. b. two sperm unite with one egg. c. two sperm unite with the central cell. d. one sperm unites with the egg and another sperm unites with the male gametophyte. e. one sperm unites with the egg and another sperm unites with a pollen grain.
The three periods of the Mesozoic era in sequence from most ancient to most recent are
A. Permian, Triassic, and Jurassic. B. Cretaceous, Jurassic, and Triassic. C. Silurian, Ordovician, and Cambrian. D. Triassic, Jurassic, and Cretaceous. E. Cambrian, Ordovician, and Silurian.
What phenotypic ratio would you expect as a result of a test cross between a dihybrid organism and one that is homozygous recessive for alleles at two independent loci?
A) 3:1 B) 1:2:1 C) 1:1:1:1 D) 9:3:3:1 E) 9:4:2:1