LABORATORY EXERCISES IN GENETICS a. On the basis of this pedigree, what do you think is the most likely mode of inheritance for Duchenne Muscular Dystrophy? are most likly made op intentence for Duchenne Miscular Rysty Uale b. If couple III-7 and IlI-8 have another child, what is the probability that the child will have Duchenne Muscular Dystrophy? c. If IlI-2 and IlI-7 mated, what is the probability that one of their children would have the disease?

Codominance pattern of inheritance: Two equally dominant alleles (IA and IB) and one recessive (i)Fill in the chart with the missing information. Remember, blood genotypes are indicated with IA IB and i alleles.#1. a. Write down all of the possible genotypes possible for human blood type. How many?b. evaluate the difference between genotype and phenotype by filling in the table. BLOODPHENOTYPE Possible Genotype(s Can donate blood to Can receive blood from: O     O AB   AB  (universal recipient) A     O,A B   AB, B

. The following pedigree is for a dominant phenotype governed by an autosomal allele. What does this pedigreesuggest about the phenotype, and what can you deduceabout the genotype of individual A?

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NAME: Patterns of Inheritance Worksheet 1. True Breeding Parental Cross A homozygous dominant purple flowered plant is crossed with a homozygous recessive white flowered plant. a. What are the genotypes of the parent plants? (Use the Punnett square to determine the outcomes of this cross. Remember to place the gametes along the left side and top of the square. (P=Purple, p=white) b. What is the genotype of all F₁ plants? 1 b. c. What is the phenotype of all F₁ plants? C. d. How many plants out of 4 will produce white flowers? d. a. 2. Monohybrid Cross: The F₁ offspring from the above problem are allowed to self fertilize. a. What are the genotypes of the F₁ parents? a. (Use the Punnett square to determine the outcomes of this cross. Remember to place the gametes along the left side and top of the square.) b. What is the genotype ratio for this cross? c. What is the phenotype ratio for this cross? d. How many plants out of 4 will produces white flowers? d. b. C.

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