The diagram represents a dihybrid cross between two pea plants heterozygous for both seed color and seed shape.
Answer (1)
Determine the genotype at the intersection of row Ry and column rY: RrYy.
Determine the genotype at the intersection of row rY and column rY: rrYY.
Determine the genotype at the intersection of row ry and column rY: rrYy.
Determine the genotype at the intersection of row ry and column ry: rryy.
The missing genotypes are: R r Y y , rr YY , rr Y y , rryy .
Explanation
Understand the problem We are given a dihybrid cross table with missing genotypes. Our goal is to fill in the missing genotypes based on the row and column headers. The headers represent the possible combinations of alleles from each parent (RY, Ry, rY, ry).
Identify the missing genotypes The missing genotypes are represented by RiYy, mYY, пту, and гту. We need to determine the correct combination of alleles for each of these.
Determine the missing genotypes
RiYy: This corresponds to the intersection of row 'Ry' and column 'rY'. Combining these gives us RrYy.
mYY: This corresponds to the intersection of row 'rY' and column 'rY'. Combining these gives us rrYY.
пту: This corresponds to the intersection of row 'ry' and column 'rY'. Combining these gives us rrYy.
гту: This corresponds to the intersection of row 'ry' and column 'ry'. Combining these gives us rryy.
Examples
Understanding dihybrid crosses is crucial in genetics for predicting the inheritance of two traits simultaneously. For example, a farmer might use this knowledge to predict the offspring of a cross between two plants, one with round, yellow seeds and another with wrinkled, green seeds. By understanding the probabilities of different genotypes and phenotypes, the farmer can make informed decisions about which plants to cross to achieve desired traits in their crops. This knowledge is also fundamental in understanding genetic diseases and predicting the likelihood of offspring inheriting certain conditions.
