In his genetic experiments with pea plants, Gregor Mendel studied traits th whit
ID: 181973 • Letter: I
Question
In his genetic experiments with pea plants, Gregor Mendel studied traits th white or purple flowers, smooth or wrinkled skin, and are more complex and diverse. Humans are not either tall or short: instead, there 5 so on. But many traits found in organisms a wide r polygenic inheritance, more than one g determi d depe possible heats-an example of polygenic inheritance. with contributes to a phenotype To help you understand polygenic inheritance, imagine this simplified scenario. Two genes color of a certain plant's flower, The two genes produce a range of colors from white to re on the particular combination of alleles. Red plants are homozygous AABB and white plants de omozygous aabb. When a white plant is crossed with a red plant, the F, offspring have pin k fl aBb). But what happens when two plants with pink flowers are crossed? The results are sho AB AABB AABb AAbb AaBB Ab a B AaBB AaBb aaBB ab AB AABb AaBb Aabb aaBb Ab AaB ab AaBb Aabb aaBb aabb five possible phenotypes in the F, offspring, corresponding to the number of otype: red (AABB), light red (AABb, AaBB), pink (AbBb, AAbb, aaB), light example above, can you cross two plants with light-red flowers t offspring with white flowers? Explain.Explanation / Answer
Yes it is known as back cross. Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent.