In a population of 400 salamanders, some individuals have long toes and others have short toes. This phenotypic difference is due to a single gene with dominant and recessive alleles, T and t, where T confers long toes. If the toe length gene is in Hardy Weinberg equilibrium, and 256 individuals have short toes, how many individuals are heterozygous at the toe length locus?
A) More information is needed to determine the answer.
B) 32
C) 128
D) 144
C) 128
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Cancer cells
1.have altered plasma membranes. 2.are unable to attach to other cells. 3.divide to produce a high density of cells. 4.form pseudopodia, enabling them to move about. 5.all of the choices
For how long can human oocytes remain arrested in the diplotene stage of the first meiotic division?
a. 1 month b. 9 months c. 10 years d. 50 years
These form the inner membranes of the mitochondria and are the site for energy production in the electron transport chain.
A) Cristae E) Flagella
B) Electron transport chain F) Plasma membrane
C) Microtubules G) Citric acid cycle
D) Glycolysis H) ATP
How did Davis demonstrate that bacterial cells must be in physical contact in order for genetic exchange to occur?
A. He mixed together two bacteria strains with different nutritional requirements, and then added them to agar plates that lacked their required nutrients. B. When two bacterial strains with different nutritional requirements were combined in a tube and allowed to grow for several hours, they acquired the ability to grow without the addition of biotin. C. When two bacterial strains with different nutritional requirements were separated from each other by a selective filter, they did not acquire the ability to grow on agar plates that lacked their required nutrients. D. Only when enough pressure was applied to force bacteria from one side of a selective filter to another did they acquire the ability to grow without their required nutrients. E. Nutritional deficient strains only acquired the ability to grow without their required nutrients when the pore size of a selective filter was increased to allow bacteria to pass from one side to the other.