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 8
Describe what is meant by the term 'genetic variation'.
Explain why two organisms with the same phenotype might have different genotypes.
If a child inherits a dominant allele from one parent and a recessive allele from the other, which trait will be expressed?
If a gene has three possible alleles, how many alleles does an individual organism inherit for that gene?
If a gene has two alleles, A (dominant) and a (recessive), what are the possible genotypes?
If a mother has genotype Aa and a father has genotype aa, what are the possible genotypes of their children?
If a plant has genotype tt, and t is recessive, what will be its phenotype?
In humans, brown eyes (B) are dominant over blue eyes (b). If a person has genotype bb, what is their eye color?
In pea plants, the allele for tall stems (T) is dominant over the allele for short stems (t). What is the phenotype of a plant with genotype Tt?
What do we call the different forms of a gene?
What does it mean if an allele is dominant?
What does it mean if an allele is recessive?
What is a gene?
What is meant by the term 'homozygous recessive'?
What is the difference between genotype and phenotype?
What is the function of genes in living organisms?
What is the main role of alleles in heredity?
What is the relationship between genes and chromosomes?
A gene for seed shape in a plant has two alleles: S (smooth, dominant) and s (wrinkled, recessive). If two heterozygous plants (Ss) are crossed, what is the probability that their offspring will have wrinkled seeds?
A scientist discovers a new gene in a species of bird that controls feather color. The gene has four different alleles. How many alleles can a single bird have for this gene?
