Genotype generally remains constant from one environment to another, although occasional spontaneous mutations may occur which cause it to change. These phenotypic variations are attributable to the effect of the environment on the expression and function of genes influencing the trait.

Someone with the genotype AS should only marry someone with the genotype AA because if AS marries another AS there’s one out of 4 chances (AS, AS, AA and SS) that they will have a child with the sickle-cell disease. Same applies when AC is combined.

It cannot be changed in the living time. And change depends on chance in the next generation. Genotype change is not a choice but chance. The genotypes mentioned in the question are pertaining to the genotypes of Sickle cell anemia (AA, As, ss).

They refer to the hemoglobin gene constituents on the red blood cells. AC is rare whereas AS and AC are abnormal. Compatible genotypes for marriage are: And definitely, SS and SS must not marry since there’s absolutely no chance of escaping having a child with the sickle cell disease.

The most common of these pieces of advice is for carriers of the Sickle gene (AS, SS, SC) not to marry fellow carriers of the Sickle gene. Thus, people with AS, SS and SC genotype are advised to marry only people who have the AA genotype to avoid the possibility of having SS babies.

If both are O positive then there is no risk. Now regarding the girl known to you, if she is a close relative (second or third-degree relative) then the marriage can create a reduced genetic pool. Hence, future kid may have genetic defects or you might not have kids at all due to reduced genetic pool.

Type O positive blood is given to patients more than any other blood type, which is why it’s considered the most needed blood type. 38% of the population has O positive blood, making it the most common blood type. Those with O positive blood can only receive transfusions from O positive or O negative blood types.

Rh Incompatibility in Pregnancy Problems can occur when the mother is Rh- and the baby is Rh+. This mismatch in blood type is often referred to as Rh incompatibility. This mismatch doesn’t cause any problems for the first pregnancy.

Blood Type O Linked to Fertility Problems. Oct. 25, 2010 — Researchers say having type O blood can affect a woman’s chances of getting pregnant.

Two O parents will get an O child nearly all of the time. But it is technically possible for two O-type parents to have a child with A or B blood, and maybe even AB (although this is really unlikely). In fact, a child can get almost any kind of blood type if you consider the effect of mutations.

Cervical mucus may prevent sperm from passing into the uterus, but during ovulation when the egg is released from the ovaries, the mucus gets thinner and lower in pH. These changes make the mucus a great transport medium for the sperm, and help the sperm continue traveling.

Couvade Syndrome: When Expectant Dads Get Pregnancy Symptoms. Couvade syndrome is a condition in which men with pregnant partners begin to experience symptoms of pregnancy.

When sperm are inside women’s body, they can live for up to 5 days. If you’re a man and you have sex even a few days before your partner ovulates, there’s chance they may get pregnant.