Which of the following is not a condition of genetic equilibrium?
1.Mutations are rare.
2.The population is isolated from all other populations of the species (no gene flow).
3.Mating is random.
4.All individuals survive and produce the same number of offspring.
1
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In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only redeyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The genotypes of the original parents were
a. Xw+Xw+; XwY. b. Xw+Xw; XwY. c. XwXw; Xw+Y. d. Xw+Xw; Xw+Y. e. XwXw; XwY.
In exocytosis
A) protein vesicles import large molecules into a cell. B) lipid vesicles move along the cytoskeleton and export large molecules out of a cell. C) protein vesicles move along the cytoskeleton and export large molecules out of a cell. D) lipid vesicles import large molecules into a cell
All of the following floral parts are directly involved in pollination or fertilization except the:
a. style. b. sepal. c. anther. d. stigma. e. carpel.
Cystic fibrosis is a genetic disease that results from a defective CFTR protein that alters ion flow through the cell membrane such that water does not cross the cell membrane. Gene therapy is being used to attempt to help cystic fibrosis patients. Which
of the following steps is not needed to develop a gene therapy treatment for cystic fibrosis? A) Clone the normal-functioning CFTR gene and make an RNA version of the gene. B) Make antibodies to the defective CFTR protein to enhance the patient's immune system. C) Remove cells from a patient and infect them with the recombinant virus. D) Insert the RNA version of the CFTR gene into a virus.