Genes and Alleles
Biology ⇒ Genetics and Heredity
Genes and Alleles starts at 7 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Genes and Alleles.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 11
Describe codominance and provide an example.
Describe the purpose of a test cross in genetics.
Describe the relationship between genes, alleles, and chromosomes.
Explain the concept of a carrier in genetics.
Explain the difference between dominant and recessive alleles.
A woman with genotype Aa marries a man with genotype aa. What is the probability that their child will have genotype Aa?
If both parents are heterozygous for a gene (Aa), what is the probability that their child will be homozygous recessive (aa)?
In pea plants, the allele for tall plants (T) is dominant over the allele for short plants (t). What is the phenotype of a plant with genotype Tt?
Which of the following best describes a dominant allele? (1) An allele that is always expressed in the phenotype (2) An allele that is only expressed when two copies are present (3) An allele that is never expressed (4) An allele that is found only in plants
Which of the following best describes a test cross? (1) Crossing two homozygous individuals (2) Crossing an individual with a dominant phenotype with a homozygous recessive individual (3) Crossing two heterozygous individuals (4) Crossing two individuals with the same phenotype
Which of the following best describes an allele? (1) A type of cell (2) A variant form of a gene (3) A chromosome (4) A protein
Which of the following genotypes is homozygous recessive? (1) AA (2) Aa (3) aa (4) aA
Fill in the blank: A person with genotype IAIB for the ABO blood group system has blood type ________.
Fill in the blank: The alternative forms of a gene are called ________.
Fill in the blank: The observable characteristics of an organism are known as its ________.
Fill in the blank: The set of alleles that an individual possesses is called its ________.
True or False: A gene can have more than two alleles in a population, but an individual can have only two alleles for that gene.
True or False: A person with two different alleles for a gene is said to be homozygous.
True or False: All genes have only two alleles in a population.
True or False: All mutations in genes result in a change in phenotype.
