Welcome to AP Biology. Select a seat - that will be your seat for the year . New Curriculum. Focus on 4 Big Ideas in Biology The process of evolution drives the diversity and unity of life
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Select a seat - that will be your seat for the year
5. The student can perform data analysis and evaluation of evidence
6. The student can work with scientific explanations and theories
7. The student is able to connect and relate knowledge across various scales, concepts, and representations in and across domains
Section 1 Example:
By discharging electric sparks into a laboratory chamber atmosphere that consisted of water vapor, hydrogen gas, methane, and ammonia, Stanley Miller obtained data that showed that a number of organic molecules, including many amino acids, could be synthesized. Miller was attempting to model early Earth conditions as understood in the 1950s. The results of Miller’s experiments best support which of the following hypotheses?
(A) The molecules essential to life today did not exist at the time Earth was first formed.
(B) The molecules essential to life today could not have been carried to the primordial Earth by a comet or meteorite.
(C) The molecules essential to life today could have formed under early Earth conditions.
(D) The molecules essential to life today were initially self-replicating proteins that were synthesized approximately four billion years ago
Section 2 Example:
In a certain species of flowering plant, the purple allele P is dominant to the yellow allele p.
A student performed a cross between a purple-flowered plant and a yellow-flowered plant. When planted, the 146 seeds that were produced from the cross matured into 87 plants with purple flowers and 59 plants with yellow flowers.
Calculate the chi-squared value for the null hypothesis that the purple-flowered parent was heterozygous for the flower-color gene. Give your answer to the nearest tenth.
Plants lose water from their aboveground surfaces in the process of transpiration. Most of this water is lost from stomata, microscopic openings in the leaves. Excess water loss can have a negative effect on the growth, development, and reproduction of a plant. Severe water loss can be fatal. Environmental factors have a major impact on the rate of plant transpiration.
TRANSPIRATION RATE VERSUS TEMPERATURE
Temperature (°C) 20 23 27 28
Transpiration rate (mmol/m2• sec) 1.5 3 5 4.5
Stomata Density (# of stomata/mm2)
Plant In Upper Epidermis In Lower Epidermis
Anacharis 0 0
Water lily 420 0
Black walnut 0 465
Populations of a plant species have been found growing in the mountains at altitudes above 2,500 meters. Populations of a plant that appears similar, with slight differences, have been found in the same mountains at altitudes below 2,300 meters.
(a) Describe TWO kinds of data that could be collected to provide a direct answer to the question, do the populations growing above 2,500 meters and the populations growing below 2,300 meters represent a single species?
(b) Explain how the data you suggested in part (a) would provide a direct answer to the question.
Getting to know you…
Let’s play “2 truths and 1 lie”