![]() Now instead, let’s say you have one Rh+ allele and one Rh- allele (+/-). Similarly, if you have two Rh+ alleles (+/+), you will always pass an Rh+ allele to each child. You will always pass an Rh- allele to each child. Which copy we pass down is random each time we have a child. So it makes sense that we pass only one copy of each gene down to our kids. But in this case you would be carrying a hidden Rh- allele which you could pass down to your child.Īs I said, we get one copy of each gene from mom and one from dad. So to be Rh+ you just need one copy of the Rh+ allele. Another way to say this is that Rh- is recessive to Rh+. In this case, you are Rh+ because Rh+ is dominant over the Rh. In this case you would be Rh-.īut it is less obvious when you have one copy of each (+/-). The same is true for two Rh- copies (-/-). ![]() If both copies are Rh+ (+/+), it is easy to see why you would be Rh+. One copy came from your mom and the other from your dad. Like most every other gene, we have two copies of the RHD gene. (Click here to learn why this is a bit of a simplification.) We’ll call one version Rh+ and the second Rh. Whether or not you are Rh- or Rh+ is decided by the RHD gene. Odds are long but it can happen. (Image: Flickr) The RHD Gene It is possible for two Rh+ parents to have three Rh- kids. As you’ll see, it has to do with the RHD gene and how it is passed down. In this case, the chance that all three will be negative drops to 1 in 64.įor the rest of the answer, I will explain why you can be Rh+ with three Rh- kids. It is possible for both of you to be Rh+ and have three Rh- kids. In fact not even the other parent has to be Rh. And your body doesn’t know whether it passed down an Rh+ or an Rh- with a previous child. The coin doesn’t remember what was flipped before. If you flip a coin twice and get two tails, what are the chances that you will get tails on the next flip? Still 50%. With a coin, you have a 50% chance for heads and a 50% chance for tails. There was a 1 in 8 chance of getting 3 negative-type kids. If we knew you were positive-type and the other parent was negative-type, then each child would have a 50% chance for being Rh-.įrom this you might think at least 1 of your 3 kids HAS to be Rh+. If that person and his or her partner both pass an Rh- down to a child, that child will be Rh. This means that someone who is Rh+ might have a hidden Rh- in their DNA. This is because Rh- is something called a recessive trait. You could be Rh negative (Rh-)or Rh positive (Rh+). They are said to especially appear selfish to individuals with Type A blood.Not necessarily. Type O people have been linked to characteristics such as confidence, determination, resilience, and intuition, but they are also supposedly self-centered and unstable.Because this blood type is rare, the people who have it are heavily appreciated in Japan. This blood type is largely viewed as having the characteristics of both type A and type B individuals. The purported strengths of those with type AB blood include rationality and adaptability, but their weaknesses are said to be indecision, criticalness, and forgetfulness.People with this blood type are said to clash with those with type A blood. Individuals with type B blood are supposed to be strong, passionate, empathetic, and decisive, but they have also been associated with selfishness and erratic behavior. ![]()
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