Genetics

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What is Down's Syndrome?

Back

A genetic condition caused by the presence of an extra copy of chromosome 21, leading to developmental and physical challenges.

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What is codominance in genetics?

Back

A form of inheritance where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

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What is a pedigree?

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A diagram that traces the inheritance of a particular trait through generations in a family.

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What causes Down's Syndrome?

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Nondisjunction, which is the failure of chromosomes to separate properly during cell division.

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What is Sickle Cell Disease?

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A genetic disorder characterized by the destruction of red blood cells and episodic blocking of blood vessels due to misshapen red blood cells.

Front

What is the phenotypic ratio when crossing a red flower (RR) with a speckled flower (RB)?

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2 red flowers and 2 speckled flowers.

Front

Define trisomy.

Back

A genetic condition where an individual has three copies of a chromosome instead of the usual two.

Front

What is the significance of chromosome 21 in genetics?

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Chromosome 21 is associated with Down's Syndrome when there is an extra copy, leading to the condition.

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What is the role of alleles in genetics?

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Alleles are different versions of a gene that determine specific traits in an organism.

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What is the difference between genotype and phenotype?

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Genotype refers to the genetic makeup of an organism, while phenotype is the observable physical or biochemical characteristics.