IQWST LS3 Lessons 4-7

Front

What is an allele?

Back

An allele is a variant form of a gene that can produce different traits. For example, the gene for flower color may have a purple allele and a white allele.

Front

What does genotype mean?

Back

Genotype refers to the genetic makeup of an organism, specifically the alleles it possesses for a particular trait.

Front

What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present in the genotype.

Front

What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present in the genotype.

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic outcomes of a cross between two organisms.

Front

What is the phenotype?

Back

Phenotype refers to the observable characteristics or traits of an organism, which result from the interaction of its genotype with the environment.

Front

What does homozygous mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as AA or aa.

Front

What does heterozygous mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Aa.

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygote are fully expressed, resulting in a phenotype that is neither dominant nor recessive.

Front

What is the purpose of a test cross?

Back

A test cross is used to determine the genotype of an organism with a dominant phenotype by crossing it with a homozygous recessive organism.