A-Level Biology Question Analysis Topic: Biology - Short Questions
Exam Question:
1) It is said apomixis is a type of asexual reproduction. Justify.
2) What is the origin of replication in chromosome? State its function.
3) Write the number of chromosomes body cells of honey bee workers and drone have.
Answer:
For A-Level Biology, you should know:
1)
By producing seeds devoid of the function of gametes, apomixis avoids the meiosis and fertilization processes that result in the formation of embryos. Thus, apomixis is an asexual reproductive method.
2)
An origin of replication is a DNA sequence where chromosomal, plasmid, or viral replication starts. A single origin is adequate for tiny DNAs, such as bacterial plasmids and small viruses.
Larger DNAs have multiple origins, and DNA replication is started at each one because it would take too long to replicate the entire DNA mass if replication had to start at just one origin.
3)
The bee has various chromosomal counts. A female honey bee, whether a queen or worker bee, has 32 chromosomes. A female honey bee has 32 chromosomes, of which 16 come from the egg of the queen and 16 from the sperm of the drones.
Male honey bees are drones. Only when a drone hatches from the unfertilized queen bee's egg does it contain all 16 chromosomes. Hence, drones have a single pair of chromosomes.
Work hard for your A-Level Biology examination!
End of analysis. Great!
