The blending inheritance hypothesis proposed that the genetic material from parents is mixed in the offspring. As a result, traits of offspring and later descendants should lie between the phenotypes of parents. Mendel, in contrast, proposed that genes are discrete and that their integrity is maintained in the offspring and in subsequent generations. Suppose the year is 1890. You are a horse breeder who has just read Mendel's paper. You don't believe his results, however, because you often work with cremello (very light-colored) and chestnut (reddish-brown) horses. You know that when you breed a cremello individual from a pure-breeding line with a chestnut individual from a pure-breeding line, the offspring are palomino—meaning they have an intermediate (golden-yellow) body color. What additional cross would you do to test whether Mendel's model is valid in the case of genes for horse color? According to his model, what offspring phenotype frequencies would you get from your experimental cross? Explain why your cross would test Mendel's model versus blending inheritance.

Video transcript

Hello everyone here We have a question telling us that a balinese crosses a plant with red flowers with another plant of the same species with white flowers and discovers that the F. One generation has plants with pink flowers. When he crosses these F one plants, he obtained red, pink and white flowers and a ratio of 1 to 2 to one. What do you think the genotype of pink flowers will be if the flower color alleles are capital are red and lower case are white. So this is a case of incomplete dominance. So that means that Our F. one, which is our pink is capital R. Lowercase R. So R. F. Two. By crossing the two. Pink Would give us our 1-2-1 ratio. That was mentioned in the question. So our f. two is capital R. Capital R. So red capital R. Lowercase R. Pink capital R. Lowercase are pink and lower case R. Lowercase are white. So our answer here is C. Capital R. Lowercase. R. Thank you for watching. Bye.