The above disease condition shown in this
photograph is caused by which of the following?
a. trematodes
b. Tricinella
c. Wuchereria bancrofti
d. hookworms
e. none of these
Answer: c
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In the lab, you choose to design a simple experiment to distinguish between hydrophilic and hydrophobic substances. You start by adding equal amounts of vinegar and oil to a container
After shaking, the vinegar and oil levels separate, based upon polarity and density. To this you add glucose and sodium citrate and shake again. Where do you expect to find the glucose and sodium citrate in greatest quantities? A) Both will concentrate in the oil layer. B) The glucose will concentrate in the vinegar, sodium citrate in the oil. C) Both will concentrate in the vinegar layer. D) Sodium citrate will concentrate in the vinegar, glucose in the oil. E) Both will be uniform throughout both layers.
In maize, some alleles at the seed coat locus influence our ability to visually determine the endosperm color phenotype
Specifically, an opaque seed coat prevents us from seeing the endosperm within, while we can readily see the endosperm in seeds with transparent coats. The opaque coat color allele thus appears to mask the expression of endosperm color alleles, providing an example of A) codominance. B) pleiotropy. C) polygenic inheritance. D) epistasis. E) maternal effect.
Suppose you are a genetic counsellor, and a man and woman come to you with concerns that if they have a child together, it could have hemophilia. Also suppose that the man has an X-linked recessive form of hemophilia, but the woman does NOT, and that genetic tests reveal the woman is NOT a carrier for hemophilia. Which of the following is the best advice you could give them?
a. Each child that they produce will have a 50% chance of having hemophilia. b. None of their offspring should have hemophilia, but each of their female offspring will be carriers for hemophilia. c. 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. d. Each of their male offspring will have hemophilia, and each of their female offspring will have a 50% chance of
What holds together the chromatid from one homologous chromosome to a non-sister chromatid of the other homologue at the site of a chiasma?
a) covalent bonds b) ionic bonds c) H bonds d) van der Waals forces e) disulfide linkages