Sickle Cell Anaemia
Do suffers of sickle cell Anaemia die before what happens
before they can reproduce but it doesn't die out
What does Huntington's Chorea result in
The disorder of the nervous system results in shaking erratic body movements and severe mental deterioration
What are the two types of Variation
Genetic Variation, Environmental variation
What are short sections of chromosomes called
Genes
What type of chromosomes do females have
XX
What is sickle cell Anemia caused by
By a Recessive Allele
What is Huntington's chorea caused by
By a dominant Allele
What does Variation mean
how animals and plants of the same species look or behave slightly different from each other
How many pairs of chromosomes do you have
23 pairs
What is the common factor between two chromosomes in a pair
They both contain the same basic genes
What is sickle cell Anaemia cause
It causes the red blood cells to be shaped like sickles instead of the normal round shape
What is the chance of a child who is inheriting Huntington's Chorea if just one parent is a carrier
50% chance
Type of example of Environmental variation
Its shown in twins
How many chromosomes do you have
46
What happens when single chromosomes meet up at fertilisation
they seek out their counterpart from the other gamete
What are the genetics in Sickle Cell Anaemia identical to
Cystic Fibrosis because both diseases are caused by a recessive allele. Hence if both parents are carriers theres a 1 in 4 chance each child will develop it
What is the carrier parent for Huntington's Chorea
The carrier parent will of course be a sufferer too since the allele is dominant, but the symptoms do not appear until after the age of 40 by which it has already been passed down to generations.
What leads to variations
The differences between you and your parents.
How many chromosomes does a gamete have
They all have half the number of chromosomes of a body cell.
What type of chromosomes do males have
XY
Why doesn't sickle cell anaemia die out
It doesn't die out because the carriers of the recessive allele which causes it are more immune to malaria. Hence being a carrier increases their chance of survival in some parts of the world.
How can Huntington's chorea be inherited
It can be inherited from one parent who has the disorder.
Whats in a pair of chromosomes
In each pair there is one you got from your father and one you got from your mother
What do the XY symbols in your chromosomes decide
They decide whether your a male or a female