Multiple Choice
Which of the following is an example of a monohybrid cross?
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2. Mendel's Laws of Inheritance
Monohybrid Cross
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In a monohybrid cross between two heterozygous pea plants (genotype Aa), what is the expected phenotypic ratio among the offspring if 'A' is dominant over 'a'?
A
3 dominant : 1 recessive
B
1 dominant : 1 recessive
C
All dominant
D
2 dominant : 2 recessive
Verified step by step guidance1
Identify the genotypes of the parent plants. Since both are heterozygous, their genotype is Aa.
Set up a Punnett square with one parent's alleles (A and a) on the top and the other parent's alleles (A and a) on the side.
Fill in the Punnett square by combining the alleles from each parent to find the possible genotypes of the offspring: AA, Aa, Aa, and aa.
Determine the phenotype for each genotype. Since 'A' is dominant over 'a', both AA and Aa will show the dominant phenotype, while aa will show the recessive phenotype.
Count the number of offspring with dominant and recessive phenotypes to find the phenotypic ratio, which will be 3 dominant : 1 recessive.
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