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How Roloff of "Little People, Big World" have three children normal size?
This has been plaguing me for a while. In the show "Little People, Big World" Roloff family has two parents dwarf, a dwarf son, and three children of normal size. Now in From what I learned in the genetics class (and my little research on the Internet) from a dwarf recessive gene. This means that for someone to be a dwarf phenotype, they must have two dwarf genes and no "normal size" genes, because even a "normal size" gene result in the child being of normal size. But Roloff, both of which are dwarf, have not one but three children's normal size. How is this possible genetically? UPDATE: Before I posted this question, I checked online and there was a website that told me that the gene dwarfism is recessive. After further research (and special thank you to those who responded, I discovered that the dwarf gene is, in fact, dominant, which is more logical. Thank you to those who responded. Congratulations to you all!
Both are dominant for dwarfism. If they have children then the normal size should also be recessive as well (ie, heterozygous - Dd). So at every birth (using a Punnet square), they have a 25% chance of having a child homozygous dominant (DD), 25% chance of having a child homozygous recessive (dd - that child will not be a dwarf) and a 50% chance of having a child heterozygous dominant (DD). The could have had 10 children were normal if these genes are passed. So, apparently their 3 children all had a normal recessive from each parent so they are jj. The chances were low but if it can happen randomly. Their twins are fraternal, since one is JJ or JJ and the other is dd. So, two eggs were fertilized by different sperm carrying two different genes. Its all rather random and further complicated as I explained, but it gives a basic idea.
No-sew Baby & Child Size Hat Stand.