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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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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Human blood type exhibits which two types of non-Mendelian traits?
Co-dominance or incomplete dominance
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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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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 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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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 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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What's the difference between dominant and recessive genes?
Dominant genes overrule others. Recessive genes are part of your genes, but not usually expressed if the dominant overrules it.
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What is a sex-linked gene?
Sex-linked, as related to genetics, refers to characteristics (or traits) that are influenced by genes carried on the sex chromosomes
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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'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