The genotype of the parents, if they are normal and produce an albino child. Introduction: The allele is the form of a single gene present in an organism. The different combination of the alleles determines the genotype and phenotype of the organism. The allele can be of two types dominant or recessive. The dominant allele has a property to mask the effect of the recessive allele in heterozygote condition.

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Chapter 7, Problem 4GP

Summary Introduction

To determine:

The genotype of the parents, if they are normal and produce an albino child.

Introduction:

The allele is the form of a single gene present in an organism. The different combination of the alleles determines the genotype and phenotype of the organism. The allele can be of two types dominant or recessive. The dominant allele has a property to mask the effect of the recessive allele in heterozygote condition.

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In humans, the allele for normal blood clotting, H, is dominant to the allele for hemophilia, h. This is a sex-linked trait found on the X chromosome. A woman with normal blood clotting has four children: a normal son, a hemophiliac son, and two normal daughters. The father has normal blood clotting. What is the genotype for each member of the family?

1. A) Apply the concept of sex linkage to explain why color blindness is more prevalent in men than in women. B) Mary is concerned that she may be a carrier for hemophilia, a sex-linked condition located on the X chromosome. Mary is married to John, who doesn't have hemophilia. Assuming Mary is a carrier, what are the genotype ratios expected for Mary and John's kids (specify for boys and for girls)? C) Mary and John have 2 boys, none of them has hemophilia. Can we use this fact as proof that Mary does not carry the allele for hemophilia? Explain your argument.