Biology — Genetics, Evolution & Ecology (Study Q&A)
Answers highlighted • Preserved original order • Updated January 25, 2026
Alleles that are neither dominant nor recessive to one another, so both alleles are always
expressed in the phenotype.
Correct Answer: Codominant
The inheritance of a single gene
Correct Answer: Monohybrid inheritance
Physical, behavioural, biochemical expression of an organisms genotype
Correct Answer: Phenotype
The type of genes an individual has
Correct Answer: Genotype
Alles that is always expressed in the phenotype
Correct Answer: Dominant
Only expressed in the phenotype when homozygous
Correct Answer: Recessive
both alleles are the same
Correct Answer: Homozygous
, Both alleles for a specific gene are different
Correct Answer: Heterozygous
Position of a gene on a chromosome
Correct Answer: Loci
A set of instructions for a specific polypeptide
Correct Answer: Gene
Different forms of a gene
Correct Answer: Allele
1. Expected ratios are probability
2. Sexual reproduction is random due to random fusion of gametes and random assortment
homologous chromosomes.
3. Small sample size
4. Linked genes
Correct Answer: Suggest four reasons why observed ratios are not the same as expected ratios (4).
1. Homologous chromosomes pair up
2. Crossing over / chiasmata form;
3. Produces new combination of alleles
4. Chromosomes separate at random
5. This produces varying combinations of genes
6. Chromatids separated at meiosis II
Answers highlighted • Preserved original order • Updated January 25, 2026
Alleles that are neither dominant nor recessive to one another, so both alleles are always
expressed in the phenotype.
Correct Answer: Codominant
The inheritance of a single gene
Correct Answer: Monohybrid inheritance
Physical, behavioural, biochemical expression of an organisms genotype
Correct Answer: Phenotype
The type of genes an individual has
Correct Answer: Genotype
Alles that is always expressed in the phenotype
Correct Answer: Dominant
Only expressed in the phenotype when homozygous
Correct Answer: Recessive
both alleles are the same
Correct Answer: Homozygous
, Both alleles for a specific gene are different
Correct Answer: Heterozygous
Position of a gene on a chromosome
Correct Answer: Loci
A set of instructions for a specific polypeptide
Correct Answer: Gene
Different forms of a gene
Correct Answer: Allele
1. Expected ratios are probability
2. Sexual reproduction is random due to random fusion of gametes and random assortment
homologous chromosomes.
3. Small sample size
4. Linked genes
Correct Answer: Suggest four reasons why observed ratios are not the same as expected ratios (4).
1. Homologous chromosomes pair up
2. Crossing over / chiasmata form;
3. Produces new combination of alleles
4. Chromosomes separate at random
5. This produces varying combinations of genes
6. Chromatids separated at meiosis II
