pedigree review

Front

What is a pedigree chart?

Back

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

Front

What does the symbol 'B' represent in genetics?

Back

In genetics, 'B' typically represents a dominant allele, while 'b' represents a recessive allele.

Front

What is the genotype of an individual with a dominant phenotype but unknown genotype?

Back

The genotype could be either homozygous dominant (BB) or heterozygous (Bb).

Front

What does a full shaded square represent in a pedigree chart?

Back

A full shaded square represents an affected male in a pedigree chart.

Front

What does a half shaded circle represent in a pedigree chart?

Back

A half shaded circle represents a carrier female who does not express the trait.

Front

What is the genotype of an individual that is homozygous recessive?

Back

The genotype is represented as 'rr'.

Front

What does it mean if an individual is heterozygous?

Back

An individual is heterozygous if they have two different alleles for a particular gene, such as 'Bb'.

Front

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

Back

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

Front

What is the significance of the widow's peak trait in genetics?

Back

The widow's peak is a trait that is often used to illustrate dominant inheritance patterns in pedigree analysis.

Front

What is the genotype of individual III-3 if they express a recessive trait?

Back

The genotype of individual III-3 is 'gg'.