3.3 Using the forked-line, or branch diagram, method, determine the genotypic and phenotypic ratios of these trihybrid crosses: (a) AaBbCc X AaBBCC, (b) AaBBCc X aaBBCc, and (c) AaBbCc × AaBbCc.

6.4 Write genotypes correctly to indicate if two genes are linked or not and if linked, the arrangement of the alleles on homologues.

As a graduate student, you join a lab and you are looking through some old notebooks. You find a linkage map someone has drawn. G--15 mu-----T----10 mu-------B If you plan to complete a test cross with a GtB/gTb male, A) What are all of the expected progeny genotypes? B.) How many of each genotype would you expect if you collected 1000 progeny?

In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F2 spring A) Monohybrid crossB) None of these choices is correctC) testcrossD) Dihybrid cross

3.9 How many different kinds of F, gametes, F, genotypes, and F, phenotypes would be expected from the following crosses: (а) АА Х аа; (b) АА ВВ Х aa b; (c) АA ВВ СС Х аа bb cc? (d) What general formulas are suggested by these answers? ANS: F, Gametes F, Genotypes F, Phenotypes (a) 2 2 (b) 2 × 2 = 4 3 X 3 = 9 2 X 2 = 4 (c) 2 × 2 × 2 = 8 3 × 3 × 3 = 27 2 × 2 × 2 = 8 2", where n is the number of genes (d) 2" 3" 3.

11:34 Make the following Punnett square. RrYYTT x rrYytt 8*8 or 64 squares. Use a blank sheet as needed. What is the phenotypic ratio of the offspring? Your gametes: 1-3-5; 1-3-6; 1-4-5; 1-4-6; 2-3-5; 2-3-6; 2-4-5; 2-4-6;