4. Polydactyly is a condition in which individuals are born with extra fingers,

Question

4. Polydactyly is a condition in which individuals are born with extra fingers, and is caused by a and in what ratios, dominant allele. Hemophilia is a sex-linked recessive. What phenotypes would we expect to see among the children of a marnage hemophiliac man, and a woman who was heterozygous 6-fingered and a carmer for between a 5-fingered, non- hemophilia? 5. Consider the mating between two individuals of the following genotypes AaBb x aaBb a. What is the probability that an offspring from this mating will have the genotype of aabb? b. How about the genotype AaBb? c. What proportion of the offspring from this mating should show both of the dominart phenotypes?

Explanation / Answer

Answer:

4) Polydactyly - caused by dominant allele (P -Polydactyly and p - Normal)

Hemophilia - sex linked recessive (h recessive, H dominant)

Marriage between 5-fingered, non hemophilic man x 6-fingered heterozygous and carrier for hemophilia

pp x Pp

XHY x XHXh

Phenotypes and expected ratios

5) Based on the given information, the given cross is AaBb x aaBb

Parental gametes are: AB, Ab, aB, ab and aB, ab, aB, ab

The different genotypes can be represented in the form of punnett square as below:

a) Probability that an offspring from this mating will have the genotype of aabb:

b) Probability that an offspring from this mating will have the genotype AaBb

c) What proportion of the offspring from this mating show both of the dominant phenotypes?

aB ab aB ab AB AaBB AaBb AaBB AaBb Ab AaBb Aabb AaBb Aabb aB aaBB aaBb aaBB aaBb ab aaBb aabb aaBb aabb

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