Inheritance and Genetic Variation

What are chromosomes?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

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What are alleles?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

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What is a gene?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

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What is an inherited trait?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

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What is genetic variation?

• Long strands of DNA that contain lots of genes.

• Different versions of a gene.

• The basic unit of heredity; controls a specific trait.

• A characteristic passed from parent to offspring

• The differences that occur from a mixture of genes

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The offspring of asexually reproducing organisms have genes that are ____________ to that of their parent.

• different

• same

• dominant

• recessive

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The offspring of sexually reproducing organisms have genes that are _____________ from that of their parents.

• different

• same

• dominant

• recessive

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In sexually reproducing organisms, each parent contributes _____________ of the genes acquired by the offspring.

• an eighth

• a quarter

• a half

• three quarters

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The difference between genotype and phenotype is :

• Genotype shows the combination of alleles that provides the genes for a trait, while phenotype is the expression of the trait, what it will look like.

• Phenotype shows the combination of alleles that provides the genes for a trait, while genotype is the expression of the trait, what it will look like.

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Why do human siblings look similar, but not always identical if they have the same parents?

• The reason that siblings can look similar without being identical is that there is always a mutation in the chromosomes.

• The reason that siblings can look similar without being identical is that they have the exact same DNA, but it is in a different order.

• The reason that siblings can look similar without being identical is that there are multiple combinations of alleles that code for genes, that express as traits that can be inherited.

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