Genes and Alleles
Biology ⇒ Genetics and Heredity
Genes and Alleles starts at 7 and continues till grade 12.
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See sample questions for grade 9
Describe what is meant by 'codominance' in genetics.
Explain the difference between complete dominance and incomplete dominance.
Explain the difference between genotype and phenotype.
Explain why two siblings can have different phenotypes even if they have the same parents.
If a gene has three alleles (A, B, and O), how many different genotypes are possible? (1) 3 (2) 4 (3) 6 (4) 9
If a mother is homozygous dominant (AA) and a father is homozygous recessive (aa), what will be the genotype of all their children? (1) AA (2) Aa (3) aa (4) Cannot be determined
If both parents are heterozygous for a gene (Aa), what is the probability that their child will be homozygous recessive (aa)? (1) 0% (2) 25% (3) 50% (4) 75%
In a certain flower, red color (R) and white color (W) alleles show codominance. What will be the phenotype of a flower with genotype RW? (1) Red (2) White (3) Pink (4) Red and white patches
If a gene has three alleles (A, B, and O), how many different genotypes are possible? (1) 3 (2) 4 (3) 6 (4) 9
If a mother is homozygous dominant (AA) and a father is homozygous recessive (aa), what will be the genotype of all their children? (1) AA (2) Aa (3) aa (4) Cannot be determined
If both parents are heterozygous for a gene (Aa), what is the probability that their child will be homozygous recessive (aa)? (1) 0% (2) 25% (3) 50% (4) 75%
In a certain flower, red color (R) and white color (W) alleles show codominance. What will be the phenotype of a flower with genotype RW? (1) Red (2) White (3) Pink (4) Red and white patches
Fill in the blank: A person with two different alleles for a gene is said to be ________ for that gene.
Fill in the blank: The different forms of a gene are called ________.
Fill in the blank: The location of a gene on a chromosome is called its ________.
Fill in the blank: The process by which alleles are passed from parents to offspring is called ________.
True or False: A person with genotype Aa will always show the dominant trait.
True or False: A person with genotype AB for blood type expresses both A and B antigens due to codominance.
True or False: All genes have only two alleles.
True or False: Dominant alleles are always expressed in the phenotype if present.
