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The Rh blood group is determined by a single gene with two alleles-- positive and negative. The positive (Rh+) allele is dominant, so persons who are Rh+/Rh+ or Rh+/Rh- are said to be Rh-positive. Individuals with two Rh- alleles are Rh-negative.
Citation
Hall, Prentice "Biology" Upper Saddle River, New Jersey, 2002
Page 344 in human genes subtitle, blood group genes subsection , paragraph 2
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Blood type in humans is determined by a single gene that has multiple alleles?
Each person has two alleles for their blood type, one dominant and one recessive. Except for type AB blood where the alleles are co-dominant. The allele for O blood is always recessive when paired with either an A or B allele.
Can a single gene control a sigle trait?
Its possible. A single gene defines a single protein.
ABO blood groups are based on the presence of?
Antigens A & B. If the person inherits just A or B they will be in that blood group, but if they inherit both types of antigens they will be in the AB group, and if they inherit no antibodies they will be in the O group
WHAT is single gene trait?
A single-gene trait is a phenotypic trait controlled by two homologous alleles.
What is a trait controlled by a single gene that has two alleles?
widows peaks,straight hair,colored hair
If your blood group is B-positive what must your parents be?
At least one parent has the 'positive' gene, but that is the only thing that can be determined.
What is one difference between single gene trait and a polygenic trait?
Polygenic traits result in more variation because so many more alleles are involved in the process of reproduction.
What is when a group of gene pairs acts together to produce a single trait?
alleles
A group of DNA nucleotides that contains the information to produce a single protein is a?
A gene is the segment of DNA with the information for a protein/proteins.
When a group of gene pairs act together to produce a single traits?
Polygenic Inheritance
Can two parents with negative blood type have a baby with O positive blood type?
Yes parents who are both B blood group can have a child with O negative. This is because B blood group only requires one parent gene to be B to have B blood group - they may also have one O gene. People have two blood group genes, one from both parents. B gene is "dominant" as is A gene. O gene is "recessive". AB blood group means a person has one A gene and one B gene B blood group means a person has either one B gene and one O gene or two B genes A blood group means that a person has either one A gene and one O gene or two A genes O blood group means that a person has two O genes Rhesus positive or negative is similar - positive is dominant and therefore a person with one positive gene and one negative will be rhesus positive. A person who is rhesus negative has both negative genes, and received one negative gene from both parents, both who may be rhesus positive ( with one positive and one negative gene each). Importance of O negative blood - O negative blood group is called the "universal donor" because the blood is least likely to cause transfusion reactions so is safest to use in an emergency before blood groups can be identified and matched. If both parents are A+ can a child be B+?
What is the ABO blood system and Co-dominance?
This means if you get the "A" (or B) gene from one parent, and the "O" gene from another parent, your phenotype (in this case your actual blood group) will be A. The O gene doesn't produce a blood group at all, A and B genes do.
Can a man with blood group o positive be father to a baby with blood group o?
Yes, so long as the mother isn't O. The negative gene is recessive.
What is blood type inheritance and how do we record it?
All blood types are catorgorized by a single gene, and two of three allels in that gene. First start a chart with your blood type, then record all the possible combinations for that type.
If the mother is of 'o' blood group and child is also of 'o' blood group what will be the blood group of father?
The father would be 'o' because 'o' is recessive. That means that its a weaker gene, so other genes are more dominate. So if there was another gene the baby would be that blood type not 'o'. For more help Google 'Punnet Squares'
If mother is A negative blood group and the child is A positive blood group what is the father's likely blood group?
Probably more than likely A+. Because the +Rh gene is usually dominate. Take for instance- Mother is A+, Child is A=. Father is A=, In this instance the father has the dominate gene for the absence of the Rh antigen on the redcell. The mother is recessive.
Could a child of blood group B with a mother of blood group A have a father of blood group A?
Yes, either parent may have had a parent which carried the B antigen blood group gene. A parent that has A+ blood may also carry a dormant -RH (Rhesus monkey) gene inherited from a parent. Should the other parent have neg. RH blood type, a child may be born with B+ or B- RH blood type. In short; you need to know the blood group of the child parents & grandparents to determine whether B antigen blood group may or may not be excluded as a possibility.
