Meiosis is a specialized form of cell division that produces gametes for sexual reproduction.
The graph below shows the changes in the mean mass of DNA per cell (in arbitrary units) over a 12-hour period during meiosis in the specialized germ cells of a newly discovered mammal.
Use the graph to answer the following questions:
a.[1]
When is the DNA in the chromosomes being replicated (copied)? Select the correct time interval:
- Between 000 and 222 hours
- Between 222 and 555 hours
- Between 555 and 777 hours
- Between 777 and 999 hours
b.[1]
Identify the two times on the graph that represent the points at which a cell divides.
c.[1]
Determine the mean mass of DNA (in arbitrary units) in a single gamete of this mammal.
d.[1]
Determine the mean mass of DNA (in arbitrary units) in a cell of an embryo of this mammal.