Meiosis and Genetic Variation

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​

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is the stage where the cells grow.

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The amino acids form a ​

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​ that will become a ​

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polypeptide chain

protein.

ribosomes

DNA.

mRNA.

organisms

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Guanine pairs with​

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cytosine

guanine

adenine

thymine

Multiple Choice

When does DNA replication occur?

• During mitosis

• During meiosis

• After mitosis and meiosis.

• Before mitosis and meiosis.

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Translation occurs at ​

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​

Genetic Variations

Allele - a different version or form of a gene.

​​Vocabulary!

Traits - characteristic in an organism.

​​Vocabulary!

Genotype - the LETTERS that make up the genes.

Phenotype - the OBSERVABLE characteristics in an individual.

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​ The ​

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is the letters that make up the genes.

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The ​

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is the observable characteristics in an individual.

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phenotype

genotype

allele

trait

• Homozygous - genotype that has the SAME alleles.

Vocabulary!

• Heterozygous - genotype that has DIFFERENT alleles.

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Which genotypes are considered HOMOZYGOUS?

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Which genotypes are considered HETEROZYGOUS?

Vocabulary!

• Dominant- gene that is always expressed when paired with another allele. (EX. BB Bb)

• Recessive - allele that is not expressed if a dominant allele is present. (EX. bb)

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Which genotype shows a DOMINANT phenotype?

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Which genotype shows a RECESSIVE phenotype?

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Which square(s) would Tt belong in?

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Which square(s) would TT belong in?