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Question 1 (Multiple Choice Worth 2 points) A plant grows faster and fuller due to large amounts of fertilizer. If the plant cross-pollinates with another plant later, how will the use of fertilizer on the parent plant affect the plant’s offspring? All of the offspring will be taller than average because the parent plant’s genes were affected. Some of the offspring will be taller than average because some of the alleles were affected. The height of the offspring will not change because the parent’s genes did not change. The height of some of the offspring will be taller if the other parent plant was also fertilized. Question 2 (Multiple Choice Worth 2 points) What are the genotypes of the parents in the monohybrid cross below if the following offspring genotypes are predicted? ? ? ? Tt Tt ? Tt Tt TT and Tt Tt and tt TT and tt Tt and Tt Question 3 (Multiple Choice Worth 2 points) This pedigree chart tracks the inheritance of a recessive trait that is not sex-linked. Based on the information in the chart, which of the following statements is true? Individual #11 must be homozygous for the recessive trait. Individuals #3 and #4 must be heterozygous for the trait. Individual #2 must be heterozygous dominant for the trait. Individual #9 must be homozygous dominant for the trait. Question 4 (Multiple Choice Worth 2 points) If a corn plant has a genotype SsTt, what are the possible genetic combinations that could be present in a single grain of pollen produced by the plant? St, sT Ss, Tt, ST, st ST, st ST, sT, St, st Question 5 (Multiple Choice Worth 2 points) In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If a red-eyed heterozygous fly (Rr) mates with a sepia-eyed homozygous fly (rr), what are the possible genotypes of their offspring? (Hint: You many want to complete a Punnett square.) Rr only RR, Rr, and rr Rr and rr RR and Rr Question 6 (Multiple Choice Worth 2 points) A man and woman have a son who is color blind, a recessive sex-linked trait carried on the X-chromosome, but neither parent is color blind. The woman is now pregnant with their second child. Which of the following statements is true about the second child? A daughter will be color blind because the father is a carrier of the recessive allele. A son will be color blind because the mother is a carrier of the recessive allele. A daughter will not be color blind because the father is not a carrier of the recessive allele. A son will be color blind because the father’s mother must have been a carrier for recessive allele. Question 7 (Multiple Choice Worth 2 points) Which of the following genotypes is homozygous dominant? tt Ff XY SS Question 8 (Multiple Choice Worth 2 points) The allele for a widow’s peak has complete dominance over the allele for a straight hairline (w). What is the probability of two parents heterogeneous for a widow’s peak (Ww) having an offspring without a widow’s peak? 25 percent 0 percent 50 percent 75 percent Question 9 (Multiple Choice Worth 2 points) In a monohybrid cross, if the gene for tall (T) plants was incompletely dominant over the gene for short (t) plants, what would be the predicted result of crossing an intermediate (Tt) plant with a tall (TT) plant? (Hint: You may want to complete a Punnett square) 50 percent tall, 25 percent intermediate, 25 percent short 25 percent tall, 50 percent intermediate, 25 percent short 50 percent tall, 50 percent intermediate 100 percent intermediate Question 10 (Essay Worth 5 points) In guinea pigs, dark hair (D) is dominant over light hair (d) and curly hair (C) is dominant over smooth hair (c). Complete a dihybrid cross for parents with the genotypes: DdCc × DdCc and answer the following in complete sentences. Describe how you would set up a Punnett square for this cross. List the likelihood of each possible offspring genotype. List the likelihood of each possible offspring phenotype.
Q.1 The height of the offspring will not be affected because the parent's genes did not change
Q.2 Question not clear
Q.3 No pedigree chart given
Q.4 Option 4