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Biology genetics hw
Due: 2nd December 2014
What the letters DNA stand for (d)
Term that means the DNA has 2
strands that are twisted together (dh)
There are 23 pairs of these in most
human cells (c)
Sperm and/ or egg cells (g)
Name: …………………………………………
Allele that is used even if there is only
one copy of it present (d)
Part of the cell where chromosomes are
found (n)
One of these is made from many
thousands of different genes (c)
Man who first recorded the pattern in
which traits are passed between
generations (M)
Small section of DNA that codes for a
particular trait or characteristic (g)
2 reasons Mendel’s work was not
recognised til after his death.
The type of molecule which is built
using the DNA code as instructions (p)
Type of plants used by Mendel in his
experiments (p)
Type of cell that only has 23 single
chromosomes, instead of 23 pairs (g)
Different forms of one particular gene (a)
When gametes join together (f)
Each gene codes for a particular
combination of ………… ………… (aa)
Mendel’s “inherited factors” are now called
………….. / ………….. (g / c)
Part of the cell which uses the DNA
code to build proteins (r)
Allele that is expressed only when there
is no dominant allele to take over (r)
The sex chromosome in males is ……
and in females is …….
(20 marks)
When scientists look at dividing cells under a microscope, they can
see strands that contain a chemical called DNA.
A photograph of these strands can be cut up and re-arranged.
The diagram shows an arrangement of the strands from a human cell.
1.
What name is given to the strands containing DNA shown in the
diagram? alleles
chromosomes
genes
2.
How can you tell from the diagram that the cell was taken from
a man not a woman?
3.
How can you tell from the diagram that the strands are from a
body cell and not from a gamete?
3.
Which part of the cell would these strands have been found in?
Lexie Munro 2014
(4 marks)
Total………………. (max 24 + 3 for stretch)
Biology genetics hw
Due: 2nd December 2014
Name: …………………………………………
STRETCH
A certain gene codes for the production of an enzyme called ‘HEXA’.
One human genetic disorder causes damage to nerve cells in the brain.This disorder is caused
by a small change in the DNA of the HEXA gene. People with this disorder make a changed
HEXA enzyme that does not work.
Explain how a change in the DNA of the HEXA gene can result in the production of a changed HEXA
enzyme that does not work.
(3 marks)
Lexie Munro 2014
Total………………. (max 24 + 3 for stretch)