Imagine that a scientist studies two traits in peas. The scientist noticed that
ID: 192650 • Letter: I
Question
Imagine that a scientist studies two traits in peas. The scientist noticed that round is dominant over wrinkled with regard to pea shape. Additionally, yellow is dominant over green with regard to pea color To determine if these traits are linked, two individuals that are heterozygous for both traits were crossed The data in the table represent the number of offspring produced by this dybrid cross. Phenotypic ratio represents the predicted proportion of offspring with each set of traits that would be produced if the traits independently assort. Traits round, yellow round, green wrinkled, vellow wrinkled, green Phenotypic Ratio Observed Expected 9/16 3/16 3/16 1/16 491 179 165 50 498 166 166 What can be determined about these traits based on Chi-square analysis? O O O O These traits do not assort independently There are not enough data to calculate a Chi-square value A Chi-square analysis cannot determine linkage These traits assort independentlyExplanation / Answer
If two genes for seed color and seed shape are linked. In that case, we would have got progenies in which yellow color and round shape and wrinkled and green seed will have the almost same number of progeny which will be more than yellow and wrinkle and green and round seed. But the number of seeds that we have got is very different than the expected one. So, the genes are not linked and assorted independently.
In case of independent assorted genes, the ration is 9:3:3:1 which is matching from the given data. SO the answer is option D- genes are independently assorted.