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14y ago

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Is the following combination possible for blood group father o pos child1 o pos child2 o neg?

If the father's Rh allele pattern is +-, he would be Rh+ but could still pass on the - allele to the child. Combined with an O- allele from the mother, the result would be an O- child.


What combination of alleles could produce a trait controlled by a recessive allele?

recessive + recessive or tt


If a child has a characteristic that neither parent has the characteristic is what?

it could just mean someone else in the family has that characteristic.


What is the allele combination of an individual?

An allele combination refers to the specific alleles that an individual has for a particular gene. For example, a person may have two alleles for eye color, one from each parent, which could be a combination like "brown-blue" or "brown-brown". Allele combinations determine an individual's unique genetic makeup for a given trait or gene.


Can blue eyed parents have brown eyed child?

Normally, no, they can't. This is because the allele for blue eyes is recessive, whereas the allele for brown eyes is dominant. Since both parents have blue eyes they are both homozygous recessive ie. carrying only blue eye alleles. Since both parents only carry the blue eye allele they can only pass blue eye allele on to their children. BUT, there is a fractionally small possibility that a spontaneous mutation could occur in the eye colour gene in one of their gametes that would change an allele for blue eyes into an allele for brown eyes. If this gamete then takes part in fertilization then the resultant child will have brown eyes because they are now heterozygous (one blue eye allele, one brown eye allele) with the brown eye allele being dominant. ALSO, it could happen if one of your prospective parents is a chimera - a person who has effectively two genotypes because their cells originate from two different zygotes. If one of your prospective grandparents had brown eyes and gave a brown eye allele to one of this chimera's genotypes (the one responsible for forming gametes) while the other genotype of this chimera (the one responsible for forming eyes) had only blue eyed alleles, this blue eyed person could form gametes with brown eye alleles and hence have a brown eyed baby. Human chimeras are extremely rare, but an example would be Lydia Fairchild. Isn't genetics wonderful?


What One recessive and one dominate allele?

A dominant allele could be right handedness, or a straight hairline. A recessive allele could be freckles, a widows peak, clef chin, or left handedness.


How one way in which a second allele for eye colour might be different?

A second allele for eye color might differ in its genetic sequence, leading to variations in the production of pigments. For instance, while one allele may result in brown eyes by promoting the production of melanin, another allele could lead to blue eyes by reducing melanin levels. This difference in pigmentation ultimately affects the visible color of the eyes.


Can an A plus and O plus make an A- baby?

Yes, an A+ parent and an O+ parent can have an A- baby. Blood type inheritance is determined by the ABO and Rh factor systems, where the ABO blood types are determined by alleles A, B, and O. The A+ parent can pass on either an A or O allele, while the O+ parent can only pass on an O allele. The combination of A from one parent and O from the other could result in an A blood type, and if the A+ parent carries the Rh negative factor, the baby could be A-.


What happens if nondisjunction occurs during meiosos?

If nondisjunction occurs during meiosis the result could be a wide range of mutations. Most likely it would result in mosaicism meaning there will be a mixture of affected cells and non affected cells.


Would a dominant allele ever return to a population?

If a population does not have a particular dominant allele, it could return to the population through the immigration of new individuals carrying the dominant allele.


Does O positive come from A or B?

blood type 'O' is the recessive allele so A and B could carry this allele. it could be AO positive or BO positive.


What combination of alleles could produce a trait controlled by a dominant allele?

genotype