Beverley High School
Q1.The diagram below shows the production of human sperm cells.
(a) Name the organ where the processes shown in the diagram above take place.
............................................................
(1)
(b) (i) Not every cell in the diagram above contains the same amount of DNA.
Cell A contains 6.6 picograms of DNA (1 picogram = 10-12 grams).
How much DNA is there in each of the following cells?
Cell B ......................... picograms
Cell C ......................... picograms
Cell E ......................... picograms
(2)
(ii) How much DNA would there be in a fertilised egg cell?
.......................................... picograms
(1)
(iii) A fertilised egg cell divides many times to form an embryo.
Name this type of cell division.
Page 1
, Beverley High School
.............................................................
(1)
(c) After a baby is born, stem cells may be collected from the umbilical cord. These can
be frozen and stored for possible use in the future.
(i) What are stem cells?
...................................................................................................................
...................................................................................................................
...................................................................................................................
...................................................................................................................
(2)
(ii) Suggest why it is ethically more acceptable to take stem cells from an
umbilical cord instead of using stem cells from a 4-day-old embryo produced
by In Vitro Fertilisation (IVF).
...................................................................................................................
...................................................................................................................
(1)
(iii) Stem cells taken from a child’s umbilical cord could be used to treat a
condition later in that child’s life.
Give one advantage of using the child’s own umbilical cord stem cells instead
of using stem cells donated from another person.
...................................................................................................................
...................................................................................................................
(1)
(iv) Why would it not be possible to treat a genetic disorder in a child using his
own umbilical cord stem cells?
...................................................................................................................
...................................................................................................................
(1)
(Total 10 marks)
Page 2
Q1.The diagram below shows the production of human sperm cells.
(a) Name the organ where the processes shown in the diagram above take place.
............................................................
(1)
(b) (i) Not every cell in the diagram above contains the same amount of DNA.
Cell A contains 6.6 picograms of DNA (1 picogram = 10-12 grams).
How much DNA is there in each of the following cells?
Cell B ......................... picograms
Cell C ......................... picograms
Cell E ......................... picograms
(2)
(ii) How much DNA would there be in a fertilised egg cell?
.......................................... picograms
(1)
(iii) A fertilised egg cell divides many times to form an embryo.
Name this type of cell division.
Page 1
, Beverley High School
.............................................................
(1)
(c) After a baby is born, stem cells may be collected from the umbilical cord. These can
be frozen and stored for possible use in the future.
(i) What are stem cells?
...................................................................................................................
...................................................................................................................
...................................................................................................................
...................................................................................................................
(2)
(ii) Suggest why it is ethically more acceptable to take stem cells from an
umbilical cord instead of using stem cells from a 4-day-old embryo produced
by In Vitro Fertilisation (IVF).
...................................................................................................................
...................................................................................................................
(1)
(iii) Stem cells taken from a child’s umbilical cord could be used to treat a
condition later in that child’s life.
Give one advantage of using the child’s own umbilical cord stem cells instead
of using stem cells donated from another person.
...................................................................................................................
...................................................................................................................
(1)
(iv) Why would it not be possible to treat a genetic disorder in a child using his
own umbilical cord stem cells?
...................................................................................................................
...................................................................................................................
(1)
(Total 10 marks)
Page 2
