STAAR REVIEW-B.6(F&G)-Genetics: Genetic Varation

Front

What is the F1 generation in genetics?

Back

The F1 generation refers to the first filial generation of offspring resulting from a cross between two parental (P) generations.

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What is a dihybrid cross?

Back

A dihybrid cross is a genetic cross that examines the inheritance of two different traits, each represented by two alleles.

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What does homozygous recessive mean?

Back

Homozygous recessive refers to an organism that has two identical recessive alleles for a particular trait (e.g., aa).

Front

What is the probability of obtaining homozygous recessive offspring from a cross between aa and Aa?

Back

The probability is 50% for aa and 50% for Aa.

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What is meiosis?

Back

Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four genetically diverse gametes.

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What is the significance of crossing over in meiosis?

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Crossing over increases genetic variation by exchanging genetic material between non-sister chromatids.

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What is genetic variation?

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Genetic variation refers to the diversity in gene frequencies within a population, which is essential for evolution.

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What is the difference between meiosis and mitosis?

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Mitosis results in two genetically identical cells, while meiosis results in four genetically diverse gametes.

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What is a genotype?

Back

A genotype is the genetic makeup of an organism, represented by the alleles it possesses (e.g., AA, Aa, aa).

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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.