IQWST LS3 Lessons 4-7

Front

What is a dominant allele?

Back

A dominant allele is a variant of a gene that always shows up in an organism when it is present.

Front

What is a recessive allele?

Back

A recessive allele is a variant of a gene that only shows up in an organism if two copies are present.

Front

What is codominance?

Back

Codominance is a genetic scenario where both alleles in a heterozygous organism contribute to the phenotype.

Front

What is a phenotype?

Back

A phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is a genotype?

Back

A genotype is the genetic constitution of an organism, represented by the alleles it possesses.

Front

What does 'RR' represent in genetics?

Back

'RR' represents a homozygous dominant genotype for a trait.

Front

What does 'Rr' represent in genetics?

Back

'Rr' represents a heterozygous genotype for a trait.

Front

What is the phenotype of a plant with genotype 'Aa'?

Back

The phenotype of a plant with genotype 'Aa' will be round petals, as 'A' is dominant.

Front

What is the probability of getting a recessive phenotype from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.

Front

What is the significance of a Punnett square?

Back

A Punnett square is a tool used to predict the genotypes and phenotypes of offspring from genetic crosses.