genetics, punnett squares, heredity

What is the probability of producing a homozygous recessive offspring from a Tt x Tt cross?

• 10%

• 25%

• 50%

• 75%

What does it mean when an allele is dominant?

• A dominant allele is one that expresses its trait even when only one copy is present (e.g., T in Tt).

• A dominant allele is one that requires two copies to express its trait.

• A dominant allele is one that can only be expressed in the absence of a recessive allele.

• A dominant allele is one that is always expressed regardless of the organism's genotype.

What is the significance of dominant and recessive alleles in heredity?

• Dominant alleles can mask the expression of recessive alleles, influencing the phenotype of the offspring.

• Recessive alleles are always expressed in the phenotype regardless of the dominant allele.

• Dominant alleles are only expressed in homozygous conditions.

• Recessive alleles have no effect on the phenotype of the offspring.

What is a heterozygous allele pair?

• A pair of identical alleles for a gene, such as AA or aa.

• A pair of different alleles for a particular gene, such as Bb.

• A pair of alleles that are both recessive for a gene.

• A pair of alleles that are both dominant for a gene.

What is the phenotype of an organism?

• The genotype of an organism

• The observable physical characteristics of an organism

• The genetic makeup of an organism

• The evolutionary history of an organism

If B = brown fur and b = white fur, what is the probability of a brown-furred offspring from a Bb x Bb cross?

• 50%

• 75%

• 25%

• 100%

What is a cross in genetics?

• A cross is a type of genetic mutation.

• A cross is the mating of two organisms to study the inheritance of traits.

• A cross refers to the physical appearance of an organism.

• A cross is a method of cloning organisms.

What does it mean when an allele is recessive?

• A recessive allele expresses its trait only when one copy is present (e.g., Tt).

• A recessive allele only expresses its trait when two copies are present (e.g., tt).

• A recessive allele is always expressed regardless of the other allele present.

• A recessive allele can be expressed in the presence of a dominant allele.

What is a homozygous allele pair?

• A pair of alleles that are different, such as Aa

• A homozygous allele pair consists of two identical alleles for a particular gene, such as BB or bb.

• A pair of alleles that are both recessive, such as aa

• A pair of alleles that are both dominant, such as AA

What is a Punnett square?

• A diagram used to predict the genetic outcomes of a cross between two organisms.

• A tool for measuring the height of plants.

• A method for calculating the age of fossils.

• A chart for organizing different species of animals.