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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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 the name of the disease Lorenzo had in the movie?
Lorenzo had Adrenoleukodystrophy (ALD), a genetic disease that progressively destroys the brains of young boys
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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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Who is the "father" of genetics?
Gregor Mendel
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What's the difference between incomplete dominance and codominance?
In codominance, both alleles in the genotype are seen in the phenotype. In incomplete dominance, a mixture of the alleles in the genotype is seen in phenotype
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25
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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20
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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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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What is myelin?
Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord
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What's the difference between homozygous and heterozygous?
Homozygous alleles look the same, while heterozygous alleles are different
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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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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.