Mendelian and Nonmendelian Genetics Practice

Front

What is codominance in genetics?

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. Example: In chickens, black and white feathers can appear together in a speckled pattern.

Front

What is the result of multiplying two fractions, 3/4 x 3/4?

Back

The result is 9/16.

Front

What does it mean for a trait to be recessive?

Back

A recessive trait is one that is masked by the presence of a dominant trait. It only expresses itself phenotypically when an individual has two recessive alleles.

Front

What is the genotype of a homozygous dominant organism?

Back

The genotype of a homozygous dominant organism consists of two identical dominant alleles, represented as 'AA'.

Front

What is the genotype for a pea plant that is homozygous for round seeds (R) and heterozygous for yellow seeds?

Back

The genotype is RRYy.

Front

What is incomplete dominance?

Back

Incomplete dominance is a genetic situation where neither allele is completely dominant over the other, resulting in a blend of traits. Example: A red flower crossed with a white flower produces pink flowers.

Front

What is a Punnett square used for?

Back

A Punnett square is a diagram used to predict the genotypes of a particular cross or breeding experiment, showing the possible combinations of alleles.

Front

What is the phenotype of a heterozygous individual?

Back

The phenotype of a heterozygous individual is determined by the dominant allele, but the recessive allele is also present.

Front

What does the term 'homozygous' mean?

Back

Homozygous refers to having two identical alleles for a particular gene, either dominant (AA) or recessive (aa).

Front

What is the expected phenotypic ratio in a monohybrid cross?

Back

The expected phenotypic ratio in a monohybrid cross is typically 3:1, where three offspring display the dominant trait for every one that displays the recessive trait.