Lesson Worksheet: Monohybrid Inheritance Biology
In this worksheet, we will practice recalling Mendel’s laws of inheritance and interpreting genetic diagrams of monohybrid crosses.
Q1:
State the phenotypic ratio (dominant to recessive) for the Punnett square provided.
- A
- B
- C
- D
Q2:
Which of the following correctly describes the relationship between chromosomes and genes?
- AThere are many genes located on a single chromosome.
- BThere are many chromosomes within one gene.
Q3:
Which of the following Punnett squares shows the correct inheritance of sex in humans?
- A
- B
- C
- D
Q4:
State the phenotypic ratio (dominant to recessive) for the Punnett square provided.
- A3:1
- B1:3
- C2:2
- D0:4
Q5:
State the phenotypic ratio (dominant to recessive) for the Punnett square provided.
- A
- B
- C
- D
Q6:
Gregor Mendel investigated the inheritance of genes through breeding experiments using his pea plants. From these experiments, he postulated three laws of inheritance. Which of the following best explains Mendel’s law of independent assortment?
- AAlleles on separate chromosomes will not interact with each other in offspring.
- BGenes that are responsible for different characteristics will be inherited independently of each other.
- CA gamete of an organism will carry only one allele for each gene.
- DThe combination of alleles in the offspring will be dependent on the combination of alleles in the parents.
Q7:
Gregor Mendel bred a population of pea plants, producing a large number of offspring. Of this offspring 6,022 plants produced yellow seeds and 2,001 produced green seeds.
What percentage of the total offspring displayed the dominant trait? Give your answer to the nearest whole number.
Q8:
Gregor Mendel investigated the inheritance of genes through breeding experiments using his pea plants. From these experiments, he produced three laws of inheritance. Which of the following best explains Mendel’s law of segregation?
- AThe alleles for a gene are kept at separate positions on a chromosome.
- BA gamete of an organism will carry only one allele for each gene.
- CWhen gametes combine in fertilization, the alleles for each gene will come from one parent only.
- DA gamete of an organism will carry only two alleles for each gene.
Q9:
Genes carry the code for proteins which are responsible for the appearance of genetic traits. Let’s assume that the DNA sequence of a gene is changed leading to a change in its protein. The genetic trait controlled by this gene will .
- Astay the same
- Bbe duplicated
- Cbe altered
- Dbe blended with another trait
Q10:
Choose the correct statement regarding the chromosomal theory from the following.
- AOnly sex chromosomes are found as homologous pairs in somatic cells and gametes.
- BThe segregation of each pair of chromosomes into gametes is independent.
- CAfter the fertilisation of somatic cells, half of the number of chromosomes is lost to be .
- DChromosomes are found in gametes as homologous pairs.
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