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WorksheetsMonohybrid Cross Practice
Total questions: 15
Worksheet time: 45mins
What is one of the two forms of a gene called?
Allele
Chromosome
Gene Pool
Genotype
How many alleles do each person carry for a trait?
1
2
3
4
What does 'homozygous' mean?
Having two identical alleles for a particular gene.
Having two different alleles for a particular gene.
Having one dominant and one recessive allele for a particular gene.
Having no alleles for a particular gene.
What type of allele always shows up in an organism when it is present?
Recessive
Dominant
Codominant
Incomplete Dominance
In cacti, if long arms (A) are dominant to short arms (a), what percentage of offspring from two heterozygous cacti will have short arms?
0%
25%
50%
75%
What is the purpose of a test cross?
To determine the genotype of an organism with a dominant phenotype.
To identify the phenotype of a recessive organism.
To assess the environmental impact on genetic traits.
To evaluate the effectiveness of a breeding program.
What is a 'trait'?
A specific characteristic of an organism, such as eye color or height.
A type of genetic mutation that affects an organism's survival.
A behavior that organisms exhibit in response to their environment.
A classification of organisms based on their habitat.
What is the expected genotype ratio from a monohybrid cross?
1:2:1 (homozygous dominant : heterozygous : homozygous recessive)
3:1 (dominant : recessive)
1:1 (homozygous : heterozygous)
2:1 (dominant : recessive)
What does 'heterozygous' mean?
Having two identical alleles for a particular gene.
Having two different alleles for a particular gene.
Having no alleles for a particular gene.
Having one allele for a particular gene.
What does each box on a Punnett Square represent in terms of an offspring's genotype probability?
50%
25%
75%
10%
What is the expected phenotype ratio from a monohybrid cross?
1:1 (dominant : recessive)
2:1 (dominant : recessive)
3:1 (dominant : recessive)
4:0 (dominant : recessive)
Define 'genotype'.
The physical appearance of an organism.
The genetic makeup of an organism, represented by alleles.
The environmental factors affecting an organism.
The process of cell division in organisms.
Define 'phenotype'.
The genetic makeup of an organism.
The observable traits of an organism, determined by its genotype.
The process of natural selection.
The environment in which an organism lives.
What is the difference between dominant and recessive alleles?
Dominant alleles are always expressed in the phenotype, while recessive alleles are only expressed in homozygous conditions.
Dominant alleles mask the effect of recessive alleles in heterozygous conditions.
Recessive alleles are more common in a population than dominant alleles.
Dominant alleles can only be inherited from one parent, while recessive alleles can be inherited from both parents.
What is a 'Punnett Square'?
A diagram used to predict the outcome of a genetic cross.
A type of genetic mutation.
A method for measuring genetic diversity.
A tool for cloning organisms.
