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16 Cards in this Set

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What is the formula for finding the number of phenotypes given n number of genes?
# phenotypes = 2 to the n.
If there are 3 genes, how many phenotypes are there?
8 (2^3)
What is the formula for finding the number of genotype given n number of genes?
# genotypes = 3 to the n.
If there are 3 genes, how many genotypes are there?
27 (3^3)
Horizontal transmission of traits is associated with …?
Autosomal recessive inheritance
True or false, if an individual is positive for an autosomal recessive disorder then both great grandparents in a contagious pedigree must be carriers?
False, only one must be a carrier.
True or false, if an individual is positive for an autosomal recessive disorder then both grandparents (which are siblings of each other) in a contagious pedigree must be carriers?
True, both must be a carrier.
Carrier risk goes down ___ every generation.
1/2
Carrier risk goes down ½ every generation except when…?
The disease shows up again and then the risk is back to square one.
Sex linked inheritance pertains to genes on the __ chromosomes.
Sex
True or false, Sex linked chromosomes transmit similarly to those of autosomal traits?
False, they transmit differently
True or false, autosomes are the same for men and women?
True, they are the opposite of sex chromosomes.
Sex chromosomes are the same or different in men and women.
They are different.
Suppose in a pedigree, male to female transmission and female to female and male transmission is shown, but male to male transmission is not shown. To what chromosome is this condition linked and is it dominant or recessive?
X linked dominant.
If the condition appears as though it skips a generation then…?
It may be an X-linked recessive disorder.
True or false, In an X-linked recessive disorder, no father to son transmission takes place.
True