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Glossary of Bio 30 BRHS WK

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Define:
Principle of Independant Assortment
Each trait is inherited independant of other traits.
Define:
Dihybrid
When considering two different traits at once.
What was Mendel's word for 'gene'.
Factor
Define:
Epistasis
When one gene hides the expression of another gene.
What would be the blood type of a person with homozygous recessive alleles. (ii)
O type blood
What are pedigrees and what are they used for?
Pedigrees are used to trace inheritance of a trait over several generations, and look like a family 'tree'.
Define:
Autosomal
Sex-linked
Autosomal-each gender just as likely to inherit a trait. (not sex-linked)
Sex-linked-one gender more likely to inherit a certain trait. (not autosomal)
What word explains why A and B can combine to form AB type blood?
Co-dominance
When there is a 6% chance of crossover between pieces of genetic information, how close are these pieces to each other? (Include the units)
6 map units
How many different gametes can be formed from:
GgRRJj
GRJ, GRj, gRJ, gRj
A total of 4 gametes can be formed.
Are X-linked abnormalities more common in males or females?
Males, because there is no way to 'hide' these abnormalities with another X chromosome the way a female can.
What is the scientific name for the fruit fly, which is used so often in genetic studies?
Drosophila
When considering a homozygous dominant being crossed with a homozygous recessive, why does the F1 generation never show characteristics of the homozygous recessive in a simple dominance relationship?
The F1 generation always inherit a dominant allele from the homozygous dominant, therefore the offspring can only be a carrier of the recessive allele.
Why cannot a male be carrier of a sex-linked trait?
Males cannot hide sex-linked traits because they have X and Y. They must express BOTH of these chromosomes, and traits aren't hidden like when considering a female
Can the environment alter your genetic makeup?
No

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