BIOLOGY 102L PRACTICE QUESTIONS
#12- GENETICS The following practice test has been prepared for you to get a general idea of what types of questions you might be expected to answer on your final laboratory exam. The questions included here are probably easier and more general than ones you might see on your actual exam. Only a few questions from each lab exercise have been included.
To take this practice test, write the correct answers to each question on some scrap paper. Then, at the end of the test, you will find the answers. If you miss a few and are unsure why, check with your lab instructor BEFORE you take your lab exam.

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Observe the following image of a tray of corn plants, some normal and some albino.



These plants represent the offspring of a cross between two corn plants. Based on the relative frequency of each of the two types of plants, what was the genotypes of the parental plants?

They must have been heterozygous (Aa x Aa)! If they were anything else, consider the likely results:
AA x AA = all normal
AA x Aa = all normal
Aa x aa = half normal, half albino
aa x aa = all albino.

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The above image shows the results of a blood typing test. Although it may not be clearly evident, the drops containing the Anti-A, Anti-B, and Anti-Rh show a precipitate. What is the blood type of this person? If this person married someone with the same blood type, would it be possible for their children to have type "O" blood?

Blood type = AB positive.
Their children could not possibly have type "O" blood.

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Hypothetical question:

F = fat (dominant)
f = skinny
What would be the results of the following crosses:
FF x ff? = all fat
Ff x Ff? = 75% fat, 25% skinny
ff x ff? = all skinny

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