Grade 7 Heredity Quiz

What is a Punnett square used for in genetics?

• To determine the best type of fertilizer for plants.

• To calculate the speed of genetic mutations.

• To predict the weather patterns in a specific region.

• To predict the possible genotypes of offspring in a genetic cross.

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In a Punnett square, what do the letters inside the boxes represent?

• Random letters with no significance

• Alleles for a specific trait

• Genes for unrelated traits

• Different species of organisms

If a Punnett square shows that all the offspring will have the same genotype, what can you conclude about the parents?

• Both parents have the same genotype for that trait

• The parents have no influence on the offspring's genotype

• The parents have different genotypes for that trait

• One parent has a dominant genotype and the other has a recessive genotype

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Liam and William are studying genetics. They came across the terms homozygous and heterozygous genotypes. Can you explain to them the difference between these two terms?

• The difference is in the presence of RNA or DNA for a particular gene.

• The difference is in the presence of prokaryotic or eukaryotic cells for a particular gene.

• The difference is in the presence of identical or different alleles for a particular gene.

• The difference is in the presence of dominant or recessive alleles for a particular gene.

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If an organism has two different alleles for a particular trait, what is it called?

• monohybrid

• homozygous

• dihybrid

• heterozygous

In a heterozygous genotype, which allele is expressed in the phenotype?

• Incomplete allele

• Recessive allele

• Dominant allele

• Neutral allele

What is the difference between dominant and recessive alleles?

• Dominant alleles are always expressed in the phenotype, while recessive alleles are only expressed when there are no dominant alleles present.

• Dominant alleles are only expressed when there are no recessive alleles present, while recessive alleles are always expressed in the genotype.

• Dominant alleles are always expressed in the genotype, while recessive alleles are always expressed in the phenotype.

• Dominant alleles are always expressed in the phenotype, while recessive alleles are only expressed when there are no dominant alleles present.

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If an organism has two different alleles for a particular trait, which allele will be expressed in the phenotype?

• Mutated allele

• Inactive allele

• Recessive allele

• Dominant allele

How are chromosomes related to heredity?

• Chromosomes are only found in plants, not animals

• Chromosomes are responsible for controlling the weather

• Chromosomes are not related to heredity

• Chromosomes contain the genetic information that is passed from parents to offspring.

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What is the role of DNA in gene inheritance?

• It controls the growth of the offspring.

• It carries the genetic information from parents to offspring.

• It determines the eye color of the offspring.

• It is responsible for the physical traits of the parents.

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