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AgEny2l 4

the chromosomal basis of DNA

QuestionAnswer
Thomas Hunt Morgan genes are found on chromosomes
Drosophila are used because there are lots of offspring, they have four pairs of chromosomes
genetic linkage genes on the same chromosome can be linked if they are close together
X linked genes do not independently assort but instead form recombinants
during prophase 1 of meiosis chiasmata form which lead to recombinants
linkage is said to be incomplete if new combinations occur in the offspring
to make a genetic map of a chromosome recombinant frequencies are used
a 1% recombination is called a centimorgan
the smaller the recombination percentage the closer the genes
the retina contains cone cells which absorb coloured light
the gene for cones which absorb blue light are on autosmomes
the gene for cones which absorb red light(protan) and green light(deutan) is on the x chromosome
there are two types of haemophilia Haemophilia A and B
in haemophilia A factor 8 is missing
in haemophilia B Factor 10 is missing...Christmas disease
egg cells are also called homogametes
sperm cells are also called heterogametes
males have more sex linked disorders due to the length of the Y chromosome there is less likelyhood of crossing over
Fragile x syndrome caused by repeating base triplets cgg on an x chromosome
Created by: MKHealy
 

 



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