Grade 10 Biology: Patterns of Inheritance
This worksheet covers fundamental concepts of Mendelian and non-Mendelian patterns of inheritance for Grade 10 Biology students.
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Patterns of Inheritance
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Read each question carefully and answer to the best of your ability. Show all work for Punnett square problems.
1. Which of the following describes an organism that has two different alleles for a trait?
Homozygous dominant
Homozygous recessive
Heterozygous
Phenotypic
2. In incomplete dominance, what is the phenotype of a heterozygous individual?
It expresses only the dominant trait.
It expresses only the recessive trait.
It expresses a blend of both alleles.
It expresses both alleles fully and separately.
3. A gene is a segment of that codes for a specific trait.
4. The physical appearance of an organism is called its .
5. When both alleles are expressed equally in the heterozygote, this is known as .
6. In pea plants, tall (T) is dominant over short (t). Cross a heterozygous tall plant with a short plant. Fill in the Punnett Square below and answer the questions.
a) What are the genotypes of the parents?
b) What is the genotypic ratio of the offspring?
c) What is the phenotypic ratio of the offspring?
7. All genetic traits follow simple Mendelian inheritance patterns.
True
False
8. Sex-linked traits are more common in males than in females.
True
False
Match the term with its definition.
9. Allele
a. Alternative forms of a gene
10. Genotype
b. Genetic makeup of an organism
11. Phenotype
c. Physical expression of a trait
12. Dominant
d. Allele that masks another allele
13. Explain the difference between Mendelian inheritance and non-Mendelian inheritance patterns. Provide an example of each.
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