In humans, the sex of the offspring is determined by the
A) cytoplasm carried by the egg cell.
B) sex chromosome carried by the egg cell.
C) autosomes carried by the egg cell.
D) sex chromosome carried by the sperm cell.
E) autosomes carried by the sperm cell.
D
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Describe the following concepts to microscopy.
a. magnification: b. resolving power: c. contrast:
The blotting of proteins from polyacrylamide gels to nitrocellulose paper, and the subsequent identification by specific antibodies, is called a(n) ________ blot
A) Western B) Eastern C) Southern D) Northern
The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered?
A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine
The figure below shows the effect of an antagonistic pleiotropic mutation A. What would be the effect of a mutation B that delayed the onset of reproduction without changing the survival curve?
a. Genotypes carrying A and B would have a higher fitness than genotypes carrying A without B. b. Genotypes carrying A and B would have a lower fitness than genotypes carrying A without B. c. B would not have any effect on the fitness of individuals with A. d. We cannot determine the effect of B without the survival curve for individuals that are wild-type at the locus affected by A.