Cerrar
How many chromosomes are shown in this photograph?
State the sex of the person the chromosomes were taken from.
Describe how the chromosomes in the photograph differ from those found in a
typical human body cell.
The rare condition leads to the formation of abnormal sperm cells.
(i) Name the cell division that produces sperm cells.
Suggest how an individual with the chromosomes shown could be produced.
Describe two differences between selective breeding and natural selection.
Farmers sometimes use pesticides to prevent flies attacking sheep.
Give two problems with the use of chemical pesticides.
The passage describes selective breeding.
Complete the passage by writing a suitable word in each of the spaces.
Selective breeding involves ___ choosing organisms with desired ___.
These organisms are allowed to breed and produce ___ . The process is ___ for several generations.
