Sample question for a monohybrid cross The lack of pigmentation in humans is cal

Question

Sample question for a monohybrid cross The lack of pigmentation in humans is called albinism. The condition appears when an individual carries two copies of the recessive allele a. Individuals with one or more copies of the normal gene A will not have the condition. a. A normal man with an albino mother marries a normal woman with an albino father. What is the genotype of the man and his wife? b. Which of Mendel's laws is tested in the monohybrid cross e What is the likeliodth thscople will have a normal child Step 1: Determine the number and type of gametes that will be produced by each parent Step 2: Draw a Punnett square which shows the phenotypic and enotypic ratios expected from the cross Phenotypic ratio: Genotypic ratio: Step 3: Use the Punnett square to determine the fraction of the Fl generation that will be normal

Explanation / Answer

Albinism is autosomal recessive disorder where in general cases, parents remain carriers, while paternal and maternal would be affected. In this case, paternal mother is albino and maternal father is albino. Even though parents were normal, offspring would be affected out of 4,possibly 1 get affected while 2 remains heterozygous carriers and 1 remains homozygous unaffected or normal.

This obeys mendal first law of segregation bearing 3:1ratio.

This is expressed in both the sexes, hence autosomal but not expressed in every generation, hence recessive.

The affected female in 3rd generation have phenotypically normal parents, the trait here is not sex linked but yet shown by both the parents.

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