BIOL 366 Mono and Dihybrid Crosses Recitation Problem Set Directions: For problems 1-5, do the following: A. List how many genes are involved B. List how many alleles are involved. C. Identify symbols and genotypes / phenotypes D. List the genotypes of the parents. E. Diagram and complete a Punnett square F. Give the phenotype percentages/ratio of the offspring. Example. In humans, freckles are recessive to no freckles. If an individual with freckles mates with a heterozygous individual, what is the ratio of their offspring? A. 1 gene (presence or absence of freckles) F f f Ff ff f Ff ff 2 alleles - freckles or no freckles B. F_ no freckles ff freckles C. ff x Ff D. Punnett Square
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Step 1:** - Genes involved: 1 (Freckles) - Alleles involved: 2 (Freckles (F) and no freckles (f)) - Symbols and genotypes: - Freckles (dominant): F - No freckles (recessive): f - Genotypes of parents: - Parent with freckles: ff - Heterozygous parent: Show more…
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6. Lab 10: Punnett Square Problems: a. In humans freckles are dominant to no freckles. F represents the freckle allele, while f represents the no freckle allele. What are the genotype and phenotype ratios for the offspring of the following cross: Ff x Ff? (2 pts) b. In fruit flies normal wings are dominant to the Apterous, or wingless, phenotype. If a fly homozygous for normal wings is crossed to a fly without wings what are the predicted genotype and phenotype ratios of the F1 generation? (3 pts)
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Set up and solve a Punnett square for the following cross: FfTt X FfTt "F" = freckles "f" = no freckles "T" = taster "t" = non taster 2. How many DIFFERENT/UNIQUE genotypes did you get? (NOTE: I do NOT want the genotypic ratio--just a number. Look at the results of your Punnett square, and simply count the DIFFERENT genotypes) 3. Give the PHENOTYPIC ratio for the results of this cross.
Sri K.
.Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?
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