Punnett Squares

What does the term 'phenotype' refer to?

• The genetic makeup of an organism.

• The observable physical traits of an organism, resulting from the interaction of its genotype with the environment.

• The evolutionary history of an organism.

• The potential traits an organism could express under ideal conditions.

What is the genotype of a parent that can produce both dominant and recessive traits?

• AA

• Bb

• bb

• AB

What is a Punnett square?

• A diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

• A tool for measuring the height of plants in a garden.

• A method for calculating the age of fossils based on their layers.

• A chart used to track the migration patterns of animals.

If a Punnett square shows TT = 25%, Tt = 50%, and tt = 25%, what does this mean?

• It indicates a 50% chance of homozygous tall (TT), 25% chance of heterozygous tall (Tt), and 25% chance of homozygous short (tt) offspring.

• It means that in a genetic cross, there is a 25% chance of homozygous tall (TT), 50% chance of heterozygous tall (Tt), and 25% chance of homozygous short (tt) offspring.

• It shows that all offspring will be heterozygous tall (Tt).

• It suggests that there is a 100% chance of tall offspring.

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What do the letters B and b represent in genetics?

• B represents the dominant allele (brown fur) and b represents the recessive allele (white fur).

• B represents the recessive allele (brown fur) and b represents the dominant allele (white fur).

• B represents the dominant allele (black fur) and b represents the recessive allele (white fur).

• B represents the dominant allele (brown fur) and b represents the recessive allele (black fur).

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What does the term 'genotype' refer to?

• The physical appearance of an organism

• The genetic makeup of an organism, specifically the alleles it possesses

• The environmental factors affecting an organism

• The evolutionary history of an organism

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What is codominance?

• A genetic situation where one allele is completely dominant over another.

• A genetic situation where both alleles in a heterozygote are fully expressed.

• A genetic situation where neither allele is expressed in the phenotype.

• A genetic situation where alleles blend together to form a new phenotype.

What is the difference between dominant and recessive alleles?

• Dominant alleles are always expressed, while recessive alleles are never expressed.

• Dominant alleles mask the effect of recessive alleles in heterozygous conditions, meaning the dominant trait will be expressed.

• Recessive alleles are stronger than dominant alleles and always determine the phenotype.

• Dominant alleles can only be expressed in homozygous conditions.

What is the significance of the ratios in a Punnett square?

• They represent the physical traits of the parents.

• They indicate the likelihood of different genotypes and phenotypes occurring in the offspring.

• They show the number of offspring produced in a generation.

• They determine the exact traits of the offspring.

How do you determine the probability of a trait using a Punnett square?

• You count the number of times a specific genotype appears in the Punnett square and divide it by the total number of possible genotypes.

• You add the total number of alleles and divide by two.

• You randomly select genotypes from the Punnett square.

• You multiply the number of dominant alleles by the number of recessive alleles.

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