1. What is a Dihybrid Cross for Blood Types?

A dihybrid cross examines the inheritance of two different traits simultaneously. For blood types, this means considering both the ABO system and the Rh factor together to predict offspring blood types.

2. How Does the Calculator Work?

The calculator uses Mendelian genetics principles to determine:

Where:

• ABO system has three alleles: A, B, O (A and B are codominant, O is recessive)
• Rh system has two alleles: + (dominant) and - (recessive)
• Each parent contributes one allele for each system

3. Blood Type Inheritance

Details: Blood type is determined by multiple alleles at the ABO locus and the Rh factor. The ABO system has three alleles (IA, IB, i) while the Rh system has two (D, d).

4. Using the Calculator

Tips: Select the ABO blood type and Rh factor for both parents. The calculator will show all possible offspring blood types with their probabilities.

5. Frequently Asked Questions (FAQ)

Q1: Can two parents with type A blood have a child with type O?
A: Yes, if both parents are heterozygous (AO genotype), there's a 25% chance for an OO child.

Q2: What's the rarest blood type combination?
A: AB- is the rarest, occurring in less than 1% of the population.

Q3: Can Rh+ and Rh- parents have Rh- children?
A: Yes, if the Rh+ parent is heterozygous (Dd), there's a 50% chance for Rh- children.

Q4: Why do we use a dihybrid cross for blood types?
A: Because ABO and Rh are inherited independently (on different chromosomes), we need to consider both systems simultaneously.

Q5: How accurate are these predictions?
A: These are theoretical probabilities based on Mendelian inheritance. Actual outcomes may vary due to genetic complexities.