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25
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What happens to the myelin around the nerve cells of ALD boys? What causes this change to occur?
buildup of very long chain fatty acids (VLCFAs) in the brain that destroy the protective myelin sheath around nerve cells.
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15
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What's the difference between a gene & an allele?
A gene is a portion of DNA that determines a certain trait. An allele is a specific form of a gene.
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20
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What is true breeding?
A true-breeding organism is an organism that always passes down certain traits multiple generations in a row.
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Human blood type exhibits which two types of non-Mendelian traits?
Co-dominance or incomplete dominance
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What is a carrier for a gene?
A carrier is someone who carries a recessive gene for a trait/disease, but does not express that trait (or have that disease)
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baam
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star
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baam
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15
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Why are Sex-linked recessive disorders more common in males?
Men only have one X chromosome
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Can a man be a carrier of a sex-linked gene?
Only females can be carriers; males cannot be heterozygous carriers.
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What is Mendel's Law of Dominance?
Mendel's law of dominance states that in a heterozygote, one trait will hide the presence of another trait for the same characteristic
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Can a man be a carrier of a non sex-linked trait?
Yes, males can carry non-sex linked traits.
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rocket
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baam
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What's the difference between genotype and phenotype?
Genotype is what the person's DNA looks like, while phenotype is how the genes are expressed physically (example: blonde hair)
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20
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What are the three different alleles exhibited in human blood type?
There are three different alleles, known as IA, IB, and i.
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25
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What is a polygenic trait? Give an example of a human polygenic trait.
A polygenic trait is a characteristic, such as height or skin color, that is influenced by two or more genes
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Who is the "father" of genetics?
Gregor Mendel
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