Mendelian Genetics

What is a monohybrid cross?

• A genetic cross between individuals with different alleles for a single gene locus of interest.

• A genetic cross involving two different traits.

• A cross between individuals of the same genotype.

• A genetic cross that results in offspring with multiple gene variations.

What is the definition of a recessive allele?

• An allele that expresses its trait regardless of the presence of other alleles.

• An allele that only expresses its trait when two copies are present.

• An allele that is always dominant over other alleles.

• An allele that has no effect on the phenotype.

What phenotype does the genotype 'Tt' produce if 'T' is dominant for tall?

• Tall.

• Short.

• Medium.

• Dwarf.

What genotype is represented by 'tt'?

• Homozygous dominant

• Heterozygous

• Homozygous recessive

• Hemizygous

What does homozygous mean?

• Having two identical alleles for a particular gene.

• Having two different alleles for a particular gene.

• Having one dominant and one recessive allele for a particular gene.

• Having no alleles for a particular gene.

What is a Punnett square used for?

• To predict the genotypes and phenotypes of offspring from genetic crosses.

• To determine the blood type of an individual.

• To analyze the structure of DNA molecules.

• To measure the height of plants in a garden.

What does heterozygous mean?

• Having two identical alleles for a particular gene.

• Having two different alleles for a particular gene.

• Having no alleles for a particular gene.

• Having one allele for a particular gene.

What is a version of a gene called?

• An allele.

• A chromosome.

• A genotype.

• A phenotype.

What is the principle of independent assortment?

• The principle states that alleles for different traits are distributed to gametes independently of one another.

• The principle states that alleles for the same trait are inherited together.

• The principle states that traits are inherited in a fixed ratio.

• The principle states that all traits are inherited equally.

If green is dominant over purple, what is the genotype of a purple individual?

• GG

• Gg

• gg

• GgGg