![list of recessive and dominant traits list of recessive and dominant traits](http://cdn.differencebetween.net/wp-content/uploads/2015/02/640px-Autosomal_dominant.png)
![list of recessive and dominant traits list of recessive and dominant traits](https://doubtnut-static.s.llnwi.net/static/web-thumb/643972232_web.png)
For example, people have a gene that determines their blood type, and another gene that determines if they have red hair or not. ( Wikipedia, Pixabay ) Genes Cause TraitsĪ gene is like a set of instructions for making a certain trait. Pink flowers are a classic example of incomplete dominance. Red hair is a classic example of a recessive trait. Here, the child has both traits from their parents at the same time. A parent with A blood type and a parent with B blood type can have a child with AB blood type. A great example of this is when a plant with red flowers is paired with a plant with white flowers and the seeds give plants with pink flowers.įinally, there are examples when the child ends up with both parents’ traits.
![list of recessive and dominant traits list of recessive and dominant traits](https://i.ytimg.com/vi/cSDZsKjkNEQ/maxresdefault.jpg)
This situation is called incomplete dominance. When one parent has red hair and the other doesn’t, sometimes none of their kids end up with red hair! In this case, one trait is said to be dominant over the other recessive one. Sometimes when two parents with different traits have kids, all the kids end up with only one parent’s trait even though the children inherited both. And then finally, we’ll tackle the why of your question! There Are Different Kinds of Traits Then, we’ll review how genes cause traits. And how differences in genes affect those traits.īefore we go into the why, let’s back up and go over different kinds of traits. One-third of all cases are thought to be new mutations in the family (not inherited from the mother).Great question! The answer has to do with how different genes work to give traits. However, not all female carriers present these symptoms. Female carriers of the gene may show some mild signs of Factor VIII deficiency, such as bruising easily or taking longer than usual to stop bleeding when cut. Treatment is available by infusion of Factor VIII (blood transfusion). The occurrence of hemophilia B (Factor IX deficiency) is one in 20,000 live male births. The occurrence of hemophilia A (Factor VIII deficiency) is around 1 in 4500 live male births. People with hemophilia A bruise easily and can have internal bleeding into their joints and muscles. This results in abnormally heavy bleeding that will not stop, even from a small cut. Hemophilia A is a disorder where the blood cannot clot properly due to a deficiency of a clotting factor called Factor VIII. Males are affected more often than females, because the gene is located on the X chromosome. There are no serious complications however, affected individuals may not be considered for certain occupations involving transportation or the Armed Forces where color recognition is required. Their visual acuity (ability to see) is normal. Red-green color blindness simply means that a person cannot distinguish shades of red and green (usually blue-green). What are some of the different types of X-linked recessive conditions?Įxamples of X-linked recessive conditions include red-green color blindness and hemophilia A: However, there is a 50 percent chance that a son will have inherited the gene and will express the trait or disorder. There is a 50 percent chance that sons do not have the gene and will be healthy. There is a 50 percent chance that a daughter will not carry the gene and, therefore, cannot pass it on. There is a 50 percent chance that daughters carry the gene and can pass it to the next generation. For example, a woman can carry a recessive gene on one of the X chromosomes unknowingly, and pass it on to a son, who will express the trait: However, for males, there needs to be only one copy of an X-linked recessive gene in order for the trait or disorder to be expressed. X-linked recessive genes are expressed in females only if there are two copies of the gene (one on each X chromosome). Their expression in females and males is not the same. Genes on the Y chromosome do not exactly pair up with the genes on the X chromosome. Genes on the X chromosome can be recessive or dominant. Females have two X chromosomes males have one X and one Y. X-linked inheritance means that the gene causing the trait or the disorder is located on the X chromosome.