Pedigree

Front

What is a pedigree?

Back

A pedigree is a diagram that shows the occurrence and appearance of phenotypes of a particular gene or organism and its ancestors, often used to track genetic traits.

Front

What does a filled symbol represent in a pedigree?

Back

A filled symbol represents an individual who expresses the trait being studied, indicating they are affected by the condition.

Front

What does a half-filled symbol represent in a pedigree?

Back

A half-filled symbol represents an individual who is a carrier of the trait, meaning they have one dominant and one recessive allele.

Front

What does an open square represent in a pedigree?

Back

An open square represents a male individual who is not affected by the trait being studied.

Front

What does an open circle represent in a pedigree?

Back

An open circle represents a female individual who is not affected by the trait being studied.

Front

How can you determine if a trait is dominant or recessive from a pedigree?

Back

If the trait appears in every generation and is passed from affected parents to offspring, it is likely dominant. If it skips generations, it is likely recessive.

Front

What is the significance of the Roman numerals in a pedigree?

Back

Roman numerals are used to denote generations in a pedigree, with each numeral representing a different generation.

Front

What does it mean if a person has the genotype 'gg'?

Back

The genotype 'gg' indicates that the individual has two recessive alleles for a trait, meaning they express the recessive phenotype.

Front

Can males be carriers of colorblindness?

Back

No, males cannot be carriers of colorblindness; they either have the trait or do not have it, as they have only one X chromosome.

Front

What is the role of females in colorblindness inheritance?

Back

Females can be carriers of colorblindness if they have one normal vision allele and one colorblind allele, but they may not express the trait.