You are breeding different varieties of roses in your garden. When you cross a true-breeding yellow "Texas Beauty" rose with a true-breeding "Ruby" red rose, you get all red roses. But when you cross a "Texas Beauty" yellow with the yellow variety "Jealousy," you get a 9:7 ratio of red to yellow flowers! What can you conclude from these results?
A. The environment, and not genes, influences pigment in these rose varieties.
B. There are epistatic interactions between at least two genes for rose pigment.
C. The red allele is dominant to the yellow allele.
D. There is a mutation in the gene for yellow pigment in the "Jealousy" variety.
E. There is no recessive allele for the red pigment gene.
B. There are epistatic interactions between at least two genes for rose pigment.
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A) thymine B) guanine C) uracil D) adenine E) cytosine
What mechanism is not used to prevent self-pollination in angiosperms?
a. separate male and female individuals b. pollen is shed before the stigma of that flower is receptive to pollen c. pollen is shed after the stigma of that flower is receptive to pollen d. self-incompatibility genes enable a plant to recognize its own pollen e. self-incompatibility genes stimulate growth of the pollen tube
Which of the following is NOT true of chlorophyll?
A) It is found in mitochondria. B) It absorbs light at the red and blue ends of the spectrum. C) It is the main photosynthetic pigment in plants. D) It reflects green wavelengths of light. E) It is found in the thylakoid membrane.
Which of the following describes a membrane as a two-dimensional liquid of a mixed composition?
A. Diffusion B. Hypertonic C. Fluid mosaic D. Isotonic E. Osmosis