The allele HN codes for normal hemoglobin and round red blood cells. HN is codom

Question

The allele HN codes for normal hemoglobin and round red blood cells. HN is codominant with the sickle cell allele, HS, that codes for abnormal hemoglobin and sickle-shaped red blood cells. Those with two sickle cell alleles develop sickle cell anemia. Those with two normal alleles have normal hemoglobin and normal cells. What occurs in those who are heterozygous? Select one: a. Heterozygotes have nonmal hemoglobin and nomal-shaped cells. O b. Heterozygotes make both normal and abnormal hemoglobin and have both normal and abnormal cells. O c. Heterozygotes make a blended form of hemoglobin and have intermediate-shaped cells Od. Heterozygotes have sickle-cell anemia A child has the blood type AB. Which combination of blood types is possible for her parents? Seleci one O a. Type A and Type A b. Type B and Type o c. Type AB and Type C d. Type A and Type AB What is responsible for the fatal reaction that occurs when type A blood is given to an individual that has type B blood? Seleci one O a. Antibodies from the type B blood attack the antigen in the type A blood 0 b. The antigens in the type A blood attack the type B blood. c. The blood types mix to form type AB blood with both A and B antigens O d. No reaction occurs, blood type A is the universal donor.

Explanation / Answer

Answer:

1). B. Heterozygotes make both normal and abnormal hemoglobin and have both normal and abnormal cell.

Explanation:

Codominance refers to a relationship between two alleles of a gene. It occurs when both of the contributions of both alleles are visible and do not over power each other in the phenotype.

HN HN = Normal Hemoglobin, Round red blood cell

HN HS = Have both normal and abnormal hemoglobin and normal and abnormal shape red blood cell.

HS HS = Sickle cell anemia.

2). d. Type A and Type AB

Explanation:

Type A ( IAi) X Type AB (IAIB)-----Parents

3). a. Antibodies from the type B blood attach the antigen in the type A blood

Explanation:

Fatal reaction occurs when antigens of donor and antibodies of receptor is same.

Type A consists of antigen A and antibody B.

Type B consists fo antigen B and antibody A.

Fatal reaction occurs between antigen A and antibody A.

IA IB IA IAIA (A) IAIB (AB) i IAi (A) IBi (B)

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