Genetics (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 it mean if a trait is recessive?

Back

A recessive trait is one that requires two copies of the allele (homozygous) to be expressed in the phenotype. If only one copy is present (heterozygous), the dominant trait will be expressed instead.

Front

What is the genotype of an individual with blue eyes if blue eyes are a recessive trait?

Back

The genotype would be 'aa', meaning the individual has two recessive alleles.

Front

How can you identify individuals with a specific trait in a pedigree?

Back

Individuals with the trait are typically represented by shaded symbols in the pedigree.

Front

What is the probability of a child having blue eyes if both parents are heterozygous (Aa)?

Back

The probability is 25% (1/4) for the child to have blue eyes (aa).

Front

What does 'Aa' represent in genetics?

Back

'Aa' represents a heterozygous genotype, where 'A' is the dominant allele and 'a' is the recessive allele.

Front

What does 'AA' represent in genetics?

Back

'AA' represents a homozygous dominant genotype, meaning the individual has two copies of the dominant allele.

Front

What does 'aa' represent in genetics?

Back

'aa' represents a homozygous recessive genotype, meaning the individual has two copies of the recessive allele.

Front

If a mother is 'aa' and the father is 'Aa', what are the possible genotypes of their children?

Back

The possible genotypes of their children are 'Aa' (50%) and 'aa' (50%).

Front

In a pedigree, what does a square symbol represent?

Back

A square symbol represents a male individual.