Monohybrid Cross Worksheet
This worksheet focuses on monohybrid crosses, Punnett squares, and Mendelian genetics for Grade 11 science students.
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Monohybrid Cross Worksheet
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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 a monohybrid cross?
A cross involving two different traits.
A cross involving a single trait.
A cross between two homozygous recessive individuals.
A cross that results in a 9:3:3:1 phenotypic ratio.
2. If 'T' represents the dominant allele for tallness and 't' represents the recessive allele for shortness, what is the genotype of a heterozygous tall plant?
TT
Tt
tt
T or t
3. The observable characteristics of an organism are called its .
4. A purebred organism has two identical alleles for a trait and is therefore .
5. A Punnett square is used to predict the and ratios of offspring.
6. In pea plants, purple flowers (P) are dominant over white flowers (p). Cross a heterozygous purple-flowered plant with a white-flowered plant. Complete the Punnett square and determine the genotypic and phenotypic ratios of the offspring.
Genotypic Ratio:
Phenotypic Ratio:
7. A recessive allele will always be expressed if present in the genotype.
True
False
8. The Law of Segregation states that two alleles for a heritable character separate (segregate) during gamete formation and end up in different gametes.
True
False
9. Explain the difference between homozygous and heterozygous genotypes.