SDSU Biol 203 Exam 4 Feuer Questions & Answers(RATED A+)

What is the difference between heterozygous and homozygous individuals? - ANSWER All of the gametes from a homozygote carry the same version of the gene while those of a heterozygote will differ When constructing a Punnett square, the symbols on the outside of the boxes represent _______, while those inside the boxes represent _______. - ANSWER gametes, progeny True or false? The same phenotype can be produced by more than one genotype. - ANSWER True. Since there exist dominant and recessive versions of many genes, a phenotype that is based upon the dominant version will be expressed in both homozygous (AA) and heterozygous (Aa) genotypes True or false? In diploid organisms, a dominant phenotype will only be expressed if the individual is homozygous dominant for that trait. - ANSWER False. A dominant phenotype is indeed expressed if the individual is homozygous dominant for that trait, but the dominant phenotype is also expressed if the individual is heterozygous for the trait. In fact, heterozygous expression is the definition of dominant If an organism with the genotype AaBb produces gametes, what proportion of the gametes would be Bb? - ANSWER None. Alleles of the same gene must separate during gamete formation; thus, the two B alleles would be distributed to different gametes Two mice are heterozygous for albinism (Aa) . The dominant allele (A) codes for normal pigmentation, and the recessive allele (a) codes for no pigmentation. What percentage of their offspring would have an albino phenotype? - ANSWER 25. The offspring would be in a 3:1 ratio of normally pigmented mice to albino mice A tall, purple-flowered pea plant (TtPp) is allowed to self-pollinate. (The recessive alleles code for short plants and white flowers.) The phenotypic ratio of the resulting offspring is 9:3:3:1. What is the genotype of the plant whose phenotype appeared once out of every 16 offspring (the "1" in the 9:3:3:1 ratio)? - ANSWER ttpp. The smallest phenotypic group consists of the homozygous recessive plants, which in this case are short and white flowered Which of the following has had the biggest influence on increased genetic testing in the United States? - ANSWER More insurance companies are paying for the tests our friend discovers that he has the gene for an increased risk of getting early-onset Alzheimer's disease. The Genetic Information Nondiscrimination Act allows for him to not face discrimination when he applies for which of the following? - ANSWER Health insurance In which of the following states are you least likely to be discriminated against based on your genetic profile no matter what type of insurance you need? - ANSWER Oregon Your employer asks your medical provider for your entire medical record, including any genetic information. Which of the following is true? - ANSWER Federal law protects you from having your employer obtain your genetic information. Your friend's aunt finds out she has the genetic marker for early-onset Alzheimer's disease. Which of the following is true? - ANSWER She is now more likely to purchase long-term care insurance