A gene is composed of two alleles. An allele can be either dominant or recessive

Question

A gene is composed of two alleles. An allele can be either dominant or recessive. Suppose that a husband and wife, who are both carriers of the sickle-cell anemia allele but do not have the disease, decide to have a child. Because both parents are carriers of the disease, each has one dominant normal-cell allele (S) and one recessive sickle-cell allele (s). Therefore, the genotype of each parent is Ss. Each parent contributes one allele to his or her offspring with each allele being equally likely. Complete parts (a) through (c) below. (a) List the possible genotypes of their offspring. A. SS, Ss B. SS, ss C. Ss, sS D. SS, ss, Ss, sS

Explanation / Answer

Both parents have Ss alleles. Each allele contribute one allele to his or her offspring to

Male have Ss allele

Female have Ss allele

so we will use all combinations

so CHildren can have SS, Ss, sS and ss

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