The Rhesus factor blood group in humans is determined by an autosomal allele, where Rhesus positive (Rh+) is completely dominant over Rhesus negative (Rh- ). If a Rhesus negative women is carrying a child who is Rhesus positive, an injection of Rh immune globulin is often administered to prevent the female from producing Rh antibodies during pregnancy. The ABO blood group assorts independently of the Rhesus system. A woman has blood type AB negative (Rhesus negative). A man has blood type O and is heterozygous Rhesus positive. a. Indicate all the possible blood types of their children and the probability of each. (2 marks) b. What is the probability a child will be Rhesus positive (and therefore, the woman may require Rh injections during her pregnancy)? (1 mark)
Added by Vicente E.
Step 1
- The man is heterozygous Rhesus positive (Rh+), so he can pass on either Rhesus positive or Rhesus negative allele to his child. - Therefore, the possible blood types of their children are: A Rh+, A Rh-, B Rh+, B Rh- ** Show more…
Show all steps
Your feedback will help us improve your experience
Md.Daniyal Arshad and 94 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
The ABO blood type is determined by alleles IA, IB, or i, where IA and IB are co-dominant to each other but both are dominant over allele i. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. Lady Ga Ga and Guy Ga Ga with blood types AB+ and O- respectively had a baby, they named Ga Ga Goo with a blood type AB-. While at the same time in the same hospital, J. Lo and Joe Lo with blood types A-, B- had a baby they named B. Lo with blood type B+. Nurse Florence Nightingale claimed that the hospital accidentally switched the babies at birth. i. Based on your knowledge, determine the correct parents for each baby ii. Give 2 lines of supporting evidence.
Bryan V.
Rh blood type In addition to the A, B, AB, and O blood types, blood types are frequently said to be "positive" or "negative". Positive means that the Rh factor (another protein) is present in the blood; negative means the Rh factor is not present. The Rh gene has 2 alleles. A dominant Rh allele produces a protein, and people with that allele and the corresponding protein are Rh+ (Rh positive). The other allele is recessive and does not produce any protein. Individuals homozygous for this allele do not have the protein and are Rh- (Rh negative). Phenotype Genotype Homozygous or Dominant or (Rh) heterozygous? recessive? Rh+ RR Homozygous dominant Rh+ Rr heterozygous recessive Rh- rr Homo dominant Problem 4: A woman with blood type O has children with a man with blood type AB. Complete the Punnett square and answer the questions. Follow the recommendations given on the previous page on this and all blood type problems. Use the symbols IA, IB, and IO when writing genotypes, and the letters A, B, O when writing phenotypes. - Is the mother homozygous or heterozygous? heter - Is the father homozygous or heterozygous? heter - What are the chances that their children will have the following blood types? Blood type Chances A B AB O
Sri K.
The ABO blood groups in humans are determined by a multiple-allele system in which $I^{A}$ and $I^{B}$ are codominant and are both dominant to $I^{O}$. A newborn infant is type $A$. The mother is type O. Possible phenotypes of the father are a. $A, B,$ or $A B$ b. $A, B,$ or $O$ c. $\mathrm{O}$ only. d. A or AB. e. A or $\mathrm{O}$
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD
