A student placed 20 tobacco seeds of the same species on moist paper towels in each of two petri dishes. Dish A was wrapped completely in an opaque cover to exclude all light. Dish B was not wrapped. The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A. Both dishes were returned to the light and examined again at 14 days. The following data were obtained: Which of the following best supports the hypothesis that the difference in leaf color is genetically controlled? a. the number of yellow-leaved seedlings in dish A on day 7 b. the number of germinated seeds in dish A on days 7 and 14 c. the death of all the yellow-leaved seedings d. the existence of yellow-leaved seedlings as well as green-leaved ones on day 14 in dish B
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It wants to know which data point best supports the idea that the difference in leaf color is controlled by genetics, not by environmental factors. a. The number of yellow-leaved seedlings in dish A on day 7: This data point doesn't necessarily support the Show more…
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Sri K.
A student placed 20 tobacco seeds of the same species on moist paper towels in each of 2 petri dishes. Dish A was wrapped completely in an opaque cover to exclude all light. Dish B was not wrapped. The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A. Both dishes were returned to the light and examined again at 14 days. According to the results of this experiment, germination of tobacco seeds during the first week is a. increased by exposure to light b. unaffected by light intensity c. prevented by paper towels d. accelerated in green-leaved seedlings
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