Terms for genetics and Mendel's four principles.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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1. | Traits are inherited as discrete units. Biological inheritance is determined by factor that are passed from one generation to the next -- genes.
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2. Principle of Dominance | Some alleles are dominant (trait is expressed) and some are recessive (trait is not expressed when dominant present).
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3. Principle of Segregation | 2 copies of each gene separate during gamete formation. (Each adult has 2 copies of each gene- one from each parent. These genes separate from each other when gametes are formed (during meiosis)).
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4. Principle of Independent Assortment | Inheritance of one trait does not influence inheritance of another.
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Homozygous | (Pure) Both alleles are the same.
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Heterozygous | (Hybrid) Each allele is different.
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Genotype | 2 alleles (Aa, AA, aa).
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Phenotype | Physical characteristic.
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Allele | Different versions of a gene (A, a, B, b).
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In a test cross to find the unknown genotype, use... | Pure/homozygous recessive.
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Is this correct? WrWR | No, it isn't. This should be written as WWRr.
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Gamete | A mature haploid male or female cell that is able to unite with another to form a zygote.
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Diploid | A cell with paired chromosomes (before meiosis).
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Haploid | A cell with half the chromosomes (after meiosis).
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