60.1k views
0 votes
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) Genes are always written with the dominant gene first. ​ Therefore, there are two instances the offspring could have genotype Ss​ (one if the mother contributes the dominant allele and the father contributes the​ non-dominant allele; and one if the father contributes the dominant allele and the mother contributes the​ non-dominant allele). List the other two possible genotypes of the offspring.   nothing

User Tschitsch
by
8.1k points

1 Answer

4 votes

Answer:

Two other possible genotypes are: SS and ss.

Step-by-step explanation:

MOTHER ALLELES: S s

FATHER ALLELES: S s

Offspring genotype:

SS Ss Ss ss

Then, a quarter of the descendants will be homozygous for the recesive allele (ss) and an other quarter, homozygous for the dominant allele (SS)

User Cwbowron
by
8.1k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.