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The parents are both recessive (Ss) for sickle cell anemia.

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Q: A child has sickle-cell disease (ss) but neither parent is ill. What must be true of her parents and rsquo genotypes?
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If a child has sickle-cell disease (ss) but neither parent is ill. What must be true of he parents' genotypes?

The parents are both recessive (Ss) for sickle cell anemia.


A child has sickle-cell disease (ss) but neither parent is ill What must be true of her parents genotypes?

The parents are both recessive (Ss) for sickle cell anemia.


Hemophilia is a sex-linked recessive disorder. Mary does not have the disease, but both of her brothers do. Neither of her parents have the disease. What are Mary's parent's genotypes (* indicates presence of the hemophilia allele)?

X*X and XY


What are the chances a child will be born with a hereditary disorder or disease?

Depends on the disease- dominant gene or recessive gene- and the genotypes of the parents.


How many genotypes do you receive from your parents?

People receive a total of 46 genotypes from their parents.


What determines the genotypes of organism?

the genotypes of their parents


What are the genotypes of two parents that pass on the klinefelter's syndrome?

The parents have normal genotypes, because Klinefelter's syndrome is not inherited.


What do the letters inside the punnent square stand for?

The letters on the outside are the genotypes of two parents. Inside are the possible genotypes of possible offspring of the two


How are the genotype and phenotype of parents related to the genotype and phenotypes of offsprings?

The parents can pass on only the alleles of their genotypes to their offspring. Therefore, the offspring genotypes and phenotypes are dependent solely upon the alleles inherited from the parents.


What is the probability that an individual has one parent with huntington disease will also have Huntington disease?

25% will have the disease if both parents carry the gene. 50% will be carriers. 25% will be neither.


What is a punnett square used to predict?

A Punnett square is used to lay out the possible genotypes of offspring based on the genotypes of the parents being bred. From this, the probabilities of certain phenotypes and genotypes can be determined.


What percentage of possibles types of offspring had the same genotype as the parents?

That depends entirely on the genotypes of the parents.