Genetics

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What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

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What does 'homozygous dominant' mean?

Back

Homozygous dominant refers to having two identical dominant alleles for a trait, such as 'GG' for green skin in frogs.

Tags

NGSS.HS-LS1-1

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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, such as purple flowers.

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What is a mutation?

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A mutation is any change or mistake in the DNA sequence that can lead to changes in traits.

Tags

NGSS.HS-LS3-2

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What are alleles?

Back

Alleles are different forms of a gene that determine specific traits, such as blue, green, or brown eye color.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Front

What is the probability of offspring being homozygous dominant from a cross of 'GG' and 'Gg'?

Back

50%.

Tags

NGSS.HS-LS3-3

Front

What is the difference between genotype and phenotype?

Back

Genotype refers to the genetic makeup of an organism (e.g., 'GG' or 'gg'), while phenotype refers to the physical expression of that genotype (e.g., green or brown skin).

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What does 'heterozygous' mean?

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Heterozygous means having two different alleles for a particular gene, such as 'Gg'.

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What is the significance of dominant and recessive alleles?

Back

Dominant alleles mask the effect of recessive alleles in determining the phenotype.

Tags

NGSS.HS-LS4-3

Front

What is a monohybrid cross?

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A monohybrid cross is a genetic cross between parents that differ in a single trait.