A broad-sense heritability of 0.8 for a particular trait indicates that
A) phenotypic variation stems from environmental influences.
B) the trait is 80% heritable.
C) genes and environment play equal roles in shaping the trait.
D) genetic differences among individuals account for much of the phenotypic variation for that trait.
E) None of these
D
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In electron micrographs of HSV infection, it can be seen that the intact virus initially reacts with cell surface proteoglycans, then with specific receptors. This is later followed by viral capsids docking with nuclear pores
Afterward, the capsids go from being full to being "empty." Which of the following best fits these observations? A) Viral capsids are needed for the cell to become infected; only the capsids enter the nucleus. B) The viral envelope is not required for infectivity, since the envelope does not enter the nucleus. C) Only the genetic material of the virus is involved in the cell's infectivity, and is injected like the genome of a phage. D) The viral envelope mediates entry into the cell, the capsid mediates entry into the nuclear membrane, and the genome is all that enters the nucleus. E) The viral capsid mediates entry into the cell, and only the genomic DNA enters the nucleus, where it may or may not replicate.
In a pedigree:
A. males are circles; females are triangles. B. females are circles; males are triangles. C. males are squares; females are triangles. D. females are squares; males are triangles. E. males are circles; females are squares. F. females are circles; males are squares.
Using the table, which of the viruses has linear, single-stranded RNA?
a. herpesvirus
b. influenza virus
c. retrovirus
d. bacteriophages
What is the advantage of the highly condensed state of the DNA of mitotic chromosomes?
a) The condensed state allows replication to occur more rapidly as the cell enters mitosis. b) The highly condensed state favors delivery of an intact package of DNA to each daughter cell. c) The condensed state favors DNA repair prior to mitosis. d) This state allows gene expression needed during mitosis. e) The condensed state allows chromosomes to fuse more easily.