Genetics

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What is the definition of homozygous dominant?

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An organism is homozygous dominant when it has two identical dominant alleles for a trait (e.g., YY).

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What is heredity?

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Heredity is the passing on of traits from parents to offspring through genes.

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What is codominance?

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Codominance is a genetic scenario 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 incomplete dominance?

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Incomplete dominance is a genetic situation where one allele does not completely dominate another, resulting in a blend of traits (e.g., red and white flowers producing pink flowers).

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What is a genotype?

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A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., YY, Yy, or yy).

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What is a phenotype?

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A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

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What is the difference between homozygous and heterozygous?

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Homozygous means having two identical alleles for a trait (e.g., YY or yy), while heterozygous means having two different alleles (e.g., Yy).

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What is the expected percentage of homozygous recessive offspring from a monohybrid cross of two heterozygous parents?

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The expected percentage of homozygous recessive offspring (yy) is 25%.

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What is an allele?

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An allele is a variant form of a gene that can produce different traits.

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What is a chromosome?

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A chromosome is a long strand of DNA that contains many genes and is found in the nucleus of eukaryotic cells.