Question
In sickle cell anemia amino acid______ is formed as a result of point substitution.
Hint:
In sickle cell anemia, the amino acid valine is formed as a result of point substitution.
The correct answer is: Valine.
- Sickle cell anemia is caused by the replacement of a single amino acid of valine in the beta chain with glutamic acid due to a nucleotide deficiency that causes abnormal production of the beta chain of hemoglobin S.
- Abnormal hemoglobin chains form polymers upon deoxygenation, resulting in the characteristic sickle cell.
Related Questions to study
The following image shows the mechanism of _______ mutation.
Point mutation.
Inversion mutation.
Deletion mutation.
None of the above.
The following image shows the mechanism of _______ mutation.
Point mutation.
Inversion mutation.
Deletion mutation.
None of the above.
_____________ mutation causes sickle cell anemia.
Frameshift mutation.
Point mutation.
Translocation mutation.
None of the above.
_____________ mutation causes sickle cell anemia.
Frameshift mutation.
Point mutation.
Translocation mutation.
None of the above.
The picture shows which type of chromosomal mutation?
Deletion mutation.
Inversion mutation.
Translocation mutation.
Duplication mutation.
The picture shows which type of chromosomal mutation?
Deletion mutation.
Inversion mutation.
Translocation mutation.
Duplication mutation.
Down’s syndrome is an example of:
Aneuploidy
Deletion mutation
Polyploidy
Point mutation
Down’s syndrome is an example of:
Aneuploidy
Deletion mutation
Polyploidy
Point mutation
______ mutations originate during meiosis while ______ mutation originates during mitosis.
Germinal, somatic
Germinal, spontaneous
Spontaneous, point
Somatic, germinal
______ mutations originate during meiosis while ______ mutation originates during mitosis.
Germinal, somatic
Germinal, spontaneous
Spontaneous, point
Somatic, germinal
_____________ is the transfer of characters from parents to offspring.
Variation
Inheritance
Mutation
Crossing over
_____________ is the transfer of characters from parents to offspring.
Variation
Inheritance
Mutation
Crossing over
Mitosis is also known as _________________.
Equational division
Reductional division
Additional division
None of the above
None of the above
Mitosis is also known as _________________.
Equational division
Reductional division
Additional division
None of the above
None of the above
Genetic variation is not caused by:
Natural selection
Asexual reproduction
Sexual reproduction
Mutation
Genetic variation is not caused by:
Natural selection
Asexual reproduction
Sexual reproduction
Mutation
Crossing over occurs in which phase?
Prophase II
Prophase I
Metaphase II
Metaphase I
Crossing over occurs in which phase?
Prophase II
Prophase I
Metaphase II
Metaphase I
If a diploid cell with a diploid number of 36 chromosomes undergoes meiosis. How many chromosomes are present in each daughter cell after division?
18
16
24
36
If a diploid cell with a diploid number of 36 chromosomes undergoes meiosis. How many chromosomes are present in each daughter cell after division?
18
16
24
36
What is the significance of crossing over?
Cell division
Mutation
Genetic variation
All of the above
What is the significance of crossing over?
Cell division
Mutation
Genetic variation
All of the above
____________ type of cell division takes place in gametes.
Mitotic cell division
Meiotic cell division
Both A and B
None of the above
____________ type of cell division takes place in gametes.
Mitotic cell division
Meiotic cell division
Both A and B
None of the above
After which phase in the cell cycle and DNA replication, meiosis begins?
Interphase
Cytokinesis
G1phase
G2 phase
After which phase in the cell cycle and DNA replication, meiosis begins?
Interphase
Cytokinesis
G1phase
G2 phase
Sexually reproducing organisms produce gametes by the process of?
Mitosis
Meiosis
Cytokinesis
Cell division
Sexually reproducing organisms produce gametes by the process of?
Mitosis
Meiosis
Cytokinesis
Cell division
Meiosis is characterized by
Reduction division
Equal division
Both reduction and equal division
Paining of non-homologous chromosomes
Meiosis is characterized by
Reduction division
Equal division
Both reduction and equal division
Paining of non-homologous chromosomes
