The sickle cell anemia is genetic disorder, in which the red blood cell becomes sickle shaped instead of its biconcave shape. This condition is a autosomal recessive disorder.
The carriers are the people, who are unaffected by the disorder, but carry one recessive allele, which can cause the disease in next generation. They are hetrozygous for the trait.
It is estimated that 1 out of every 10 or 10% African American are the carriers of the Sickle cell anemia.
So, the correct answer is Approximately, 10% African Americans is a carrier for sickle-cell anemia.
The plasma membrane and several cytoplasmic organelles such as the ER, Golgi apparatus, secretory granules and vesicles, lysosomes, endosomes, form an endomembrane system.
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Answer:
E. bu cv+
Explanation:
Given, that bu+ and cv+ are dominant alleles whereas bu and cv are recessive alleles of the respective genes. In repulsion, the chromosome has one dominant and one recessive allele of the linked genes. According to it, if the German cockroach has bu+bu cv+cv genotype, it should be present in bu+cv/bucv+ arrangement. Thus the parental gametes from this genotype would be bu+cv and bucv+. Recombinant gametes will be bucv and bu+cv+.
Since parental gametes are produced more in number than recombinant gametes in linkage, bu+cv and bucv+ will be the most common gametes. Hence, out of the given options bucv+ set of genes will be present in the most common gametes produced by this cockroach.