Clutch Prep - BIO 1500 Final Exam Review

Clutch Prep - BIO 1500 Final Exam Review Gray seed color in peas is dominant to white. Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed among themselves, and the following progeny were produced: 302 gray and 98 white. (i) What is the most probable genotype of each parent? (ii) Based on your answer in (i) above, what genotypic and phenotypic ratios are expected in theseprogeny? (Assume the following symbols: G = gray and g = white.) a. (i) GG xgg; (ii) genotypic = 3:1, phenotypic = 1:2:1 b. (i) gg xGg; (ii) genotypic = 1:2, phenotypic = 3:1 c. (i) Gg xGg; (ii) genotypic = 3:1, phenotypic = 9:3:3:1 d. (i) GG xGg; (ii) genotypic = 1:2:1, phenotypic = 2:1 e. (i) Gg xGg; (ii) genotypic = 1:2:1, phenotypic = 3:1 PRACTICE: In the following problem, capital letters will be used to denote a dominant trait, and lowercase letters will be used for the recessive trait. In peas, the stem length may result in a tall (T) or dwarf (t) plant. What proportion of the offspring in the following crosses would be expected to be tall, and what proportion dwarf? 1. TT x tt 2. TT x Tt 3. tt x Tt The locus T (2 alleles, T1= tall plants and G2=short plants) in moss controls plant height in the gametophyte (haploid stage) but has no effect on phenotype in the sporophyte (diploid) stage. Sperm from a tall moss gametophyte fertilizes an egg from a short moss gametophyte to produce a sporophyte. This sporophyte produces spores, which grow up to be new gametophytes. What will be the heights of the next generation of gametophytes? a) all intermediate in height b) all short c) all tall d) half short and half tall e) no way to tell from the information given PRACTICE: If you cross two pea plants, one with green peas and the other with yellow peas. All of the offspring have yellow peas. You conclude: a. The yellow parent was homozygous for the recessive allele b. The yellow parent was homozygous for the dominant gene c. The yellow parent was homozygous for the dominant allele d. The yellow parent was homozygous for the recessive gene e. The yellow parent was heterozygous Any monohybrid cross consisting of one dominant and one recessive allele for the trait being studied should result in a ratio of ______________ dominant to __________________ recessive. a. Three, one b. One, one c. One, two d. Two, one e. One, three PRACTICE: Mendel's monohybrid cross of "Tt" parents resulted in a tall to short ratio of: a. 1:1 b. 1:2 c. 2:1 d. 3:1 e. 1:3 After the cell below is finished dividing, what will be a possible genotype for one of the daughter cells? a. rTdM b. RrTtDdMm c. RTDM d. RTdm e. RrTTDdMm PRACTICE: Given the cross PpQqRrSS x PPQqRRSs, what proportion of offspring are expected to be PPQQRRSS? a. 1/32