Genes, alleles, genotypes and phenotypes
8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.MS-LS3-2 · England: KS3 Biology: Inheritance, chromosomes, DNA and genes, GCSE Combined Science: Inheritance, variation and evolution
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Question 1
Genes and alleles: which statement is NOT true?
- A. Every characteristic is controlled by one single gene.
- B. Most characteristics are controlled by several genes working together.
- C. Body cells carry two alleles of each gene, one from each parent.
- D. The phenotype can be affected by the environment as well as the genotype.
Question 2
The allele G (green pods) is dominant over g. An organism has genotype gg. What is its phenotype?
- A. shows green pods
- B. does not show green pods
Question 3
Which word means: an allele that only shows its effect when two copies are present?
- A. phenotype
- B. recessive
- C. allele
- D. homozygous
Question 4
Genes and alleles: which statement is NOT true?
- A. Body cells carry two alleles of each gene, one from each parent.
- B. A recessive characteristic can skip a generation.
- C. Most characteristics are controlled by several genes working together.
- D. A heterozygous organism shows the recessive phenotype.
Question 5
An organism has the genotype RR. How is this genotype described?
- A. homozygous dominant
- B. heterozygous
- C. homozygous recessive
Question 6
Which word means: having two different alleles, such as Bb?
- A. genotype
- B. heterozygous
- C. dominant
- D. allele
Question 7
Genes and alleles: which statement is NOT true?
- A. The phenotype can be affected by the environment as well as the genotype.
- B. A recessive characteristic can skip a generation.
- C. Most characteristics are controlled by several genes working together.
- D. Every characteristic is controlled by one single gene.
Question 8
The allele B (brown fur) is dominant over b. An organism has genotype Bb. What is its phenotype?
- A. shows brown fur
- B. does not show brown fur
Question 9
Which word means: having two identical alleles, such as BB or bb?
- A. genotype
- B. allele
- C. phenotype
- D. homozygous
Question 10
Genes and alleles: which statement is NOT true?
- A. A heterozygous organism shows the recessive phenotype.
- B. Body cells carry two alleles of each gene, one from each parent.
- C. A recessive characteristic can skip a generation.
- D. Most characteristics are controlled by several genes working together.
Question 11
The allele G (green pods) is dominant over g. An organism has genotype GG. What is its phenotype?
- A. shows green pods
- B. does not show green pods
Question 12
Which word means: the alleles an organism has, written like Bb?
- A. genotype
- B. homozygous
- C. recessive
- D. phenotype
Question 13
Genes and alleles: which statement is NOT true?
- A. A recessive characteristic can skip a generation.
- B. Most characteristics are controlled by several genes working together.
- C. Dominant alleles are always the most common in a population.
- D. Body cells carry two alleles of each gene, one from each parent.
Question 14
The allele T (tall stems) is dominant over t. An organism has genotype TT. What is its phenotype?
- A. shows tall stems
- B. does not show tall stems
Question 15
Which word means: having two identical alleles, such as BB or bb?
- A. allele
- B. genotype
- C. homozygous
- D. heterozygous
Question 16
Genes and alleles: which statement is NOT true?
- A. Most characteristics are controlled by several genes working together.
- B. Dominant alleles are always the most common in a population.
- C. Body cells carry two alleles of each gene, one from each parent.
- D. The phenotype can be affected by the environment as well as the genotype.
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