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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20
What pattern of inheritance does the disease (Lorenzo had) show?
X-linked (Sex-linked) inheritance
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15
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 non sex-linked trait?
Yes, males can carry non-sex linked traits.
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20
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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15
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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25
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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15
Human blood type exhibits which two types of non-Mendelian traits?
Co-dominance or incomplete dominance
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15
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
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'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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15
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 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)