If a daughter expresses an X-linked recessive
gene, she inherited the trait from
a. her mother.
b. her father.
c. both parents.
d. neither parent.
e. her grandmother
C
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What is the frequency of the LLT-s allele in the population?
A. 1/100 B. 1/200 C. 1/1 (only one plant has it) D. Cannot tell from the information given
Based on the evolutionary tree, which letter represents the common ancestor of animals and
fungi?
a. A b. B c. C d. D
Data were collected from the heterocysts of a nitrogen-fixing cyanobacterium inhabiting equatorial ponds. Study the following graph and choose the most likely explanation for the shape of the curve
A) Enough oxygen (O2 ) enters heterocysts during hours of peak photosynthesis to have a somewhat-inhibitory effect on nitrogen fixation. B) Atmospheric nitrogen (N2 ) levels increase at night because plants are no longer metabolizing this gas, so they are not absorbing this gas through their stomata. C) Heterocyst walls become less permeable to nitrogen (N2 ) influx during darkness. D) The amount of fixed nitrogen that is dissolved in the pond water in which the cyanobacteria are growing peaks at the close of the photosynthetic day (1800 hours).
How do parents pass their chromosomes to their offspring?
What will be an ideal response?