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In a monohybrid cross, the offspring of the first set of individuals mated in a particular cross is called the:
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2. Mendel's Laws of Inheritance
Monohybrid Cross
Scelta multipla
In a monohybrid cross, what does the term genotype ratio refer to?
A
The percentage of gametes produced by each parent that carry the dominant allele ()
B
The relative proportions of different genotypes among the offspring (e.g., for )
C
The relative proportions of different phenotypes among the offspring (e.g., )
D
The probability that a single offspring will be homozygous dominant ()
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Understand that the genotype ratio in a monohybrid cross refers to the relative proportions of different genotypes among the offspring, not the phenotypes or gamete percentages.
Recall that in a monohybrid cross involving a single gene with two alleles (dominant A and recessive a), the possible genotypes are AA, Aa, and aa.
Use a Punnett square to determine the expected genotypic combinations from the parental gametes. For example, crossing two heterozygous parents (Aa x Aa) results in offspring genotypes AA, Aa, and aa.
Count the number of each genotype in the Punnett square and express their proportions as a ratio, such as 1:2:1 for AA:Aa:aa.
Recognize that this genotype ratio describes the genetic makeup distribution of the offspring, which is distinct from the phenotype ratio that describes observable traits.
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