The allele that causes sickle-cell anemia is rare in human populations that are native to northern Europe. Introduction: HbS (sickle hemoglobin) allele encodes for the defective hemoglobin in humans. HbS allele differs from normal allele ( HbA ) by one amino acid. In HbS/HbS homozygotes, alleles form faulty hemoglobin, in which RBCs (red blood cells) acquire a sickle shape. Individuals containing HbS/HbS homozygotes die due to sickle cell anemia before reproducing. HbA/HbS heterozygotes offer great resistance to malaria by not allowing the parasite to multiply inside the host cells.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21.4, Problem 3SB

Summary Introduction

To review:

The allele that causes sickle-cell anemia is rare in human populations that are native to northern Europe.

Introduction:

HbS (sickle hemoglobin) allele encodes for the defective hemoglobin in humans. HbS allele differs from normal allele (HbA) by one amino acid. In HbS/HbS homozygotes, alleles form faulty hemoglobin, in which RBCs (red blood cells) acquire a sickle shape. Individuals containing HbS/HbS homozygotes die due to sickle cell anemia before reproducing. HbA/HbS heterozygotes offer great resistance to malaria by not allowing the parasite to multiply inside the host cells.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21.4, Problem 3SB

Summary Introduction

To review:

The allele that causes sickle-cell anemia is rare in human populations that are native to northern Europe.

Introduction:

HbS (sickle hemoglobin) allele encodes for the defective hemoglobin in humans. HbS allele differs from normal allele (HbA) by one amino acid. In HbS/HbS homozygotes, alleles form faulty hemoglobin, in which RBCs (red blood cells) acquire a sickle shape. Individuals containing HbS/HbS homozygotes die due to sickle cell anemia before reproducing. HbA/HbS heterozygotes offer great resistance to malaria by not allowing the parasite to multiply inside the host cells.

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Answer 3

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21.4, Problem 3SB

Summary Introduction

To review:

The allele that causes sickle-cell anemia is rare in human populations that are native to northern Europe.

Introduction:

HbS (sickle hemoglobin) allele encodes for the defective hemoglobin in humans. HbS allele differs from normal allele (HbA) by one amino acid. In HbS/HbS homozygotes, alleles form faulty hemoglobin, in which RBCs (red blood cells) acquire a sickle shape. Individuals containing HbS/HbS homozygotes die due to sickle cell anemia before reproducing. HbA/HbS heterozygotes offer great resistance to malaria by not allowing the parasite to multiply inside the host cells.

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Answer 4

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 21.4, Problem 3SB

Summary Introduction