USA Biology Olympiad (USABO) Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the USA Biology Olympiad with engaging flashcards and multiple choice questions. Each question is accompanied by hints and detailed explanations. Ace your exam with confidence!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the probability that a couple with normal vision and both blood type A will have a daughter who is blood type O and has normal vision?

1/2
1/4
1/8
1/16

The correct answer is: 1/8

To determine the probability of a couple with normal vision and both having blood type A having a daughter who is blood type O and has normal vision, we need to analyze the genetics of blood type and vision. Blood type is governed by the ABO blood group system, which has three alleles: A, B, and O. The A and B alleles are dominant over the O allele. Since both parents have blood type A, their genotypes could either be AA or AO. 1. If both parents are AA, they can only produce offspring with blood type A. 2. If both parents are AO, there is a possibility of producing blood type A, blood type O, or blood type AB offspring. The Punnett square for two AO parents would be as follows: | | A | O | |-----|-----|-----| | A | AA | AO | | O | AO | OO | From the Punnett square, we see: - AA = blood type A - AO = blood type A - AO = blood type A - OO = blood type O This indicates that there is a 1 in 4 chance (or 25%) that the couple will