11) Tongue- curling (T) is dominant over non-curling (t). List ALL of the possib
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Question
11) Tongue- curling (T) is dominant over non-curling (t). List ALL of the possible crosses that would yield the following offspring.
a. All offspring are tongue-curlers. _________________________
b. All offspring are non-curlers. __________________________
c. Half of the offspring are curlers, half are not. ________________________
12) A man without hemophilia and a woman with hemophilia are expecting their first child. Show the Punnet square for this cross.
a. What are the odds that their child will be a daughter with hemophilia?
b. If they have a son, what is the probability that he will have hemophilia?
c. If they have a daughter, what is the probability that she wull be a carrier?
13. Suppose you have two rose plants, both with pink flowers. You cross the two plants and are surprised to see that while most offspring have pink flowers, some have red flowers and some have white flowers.
a. What is the mode of inheritance for this trait?
b. What cross should you perform to get all pink-flowered roses?
14. List the 3 temperature stages of a single PCR cycle and describe what occurs during each stage.
15. What is a primer and what role does it play in PCR?
16. A DNA sample has 2 copies of a gene. How many copies of that gene would be present after conducting PCR of that gene for 20 cycles?
________________copies
Explanation / Answer
11. Given that, tongue- curling (T) is dominant over non-curling (t).
a. All offspring are tongue-curlers. _____Cross between TT (homozygous dominant) and tt (homozygous recessive) = Tt (all tongue curlers)
b. All offspring are non-curlers. ____Cross between tt (homozygous recessive) and tt (homozygous recessive) = tt (all non-curlers)
c. Half of the offspring are curlers, half are not -----> Cross between tt (homozygous recessive) and tT (heterozygous) = tt, tT, tt, Tt (Half of the offspring are curlers, half are not).
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