Lavonne’s mother has brown eyes, and her father has blue eyes. Lavonne has brown eyes, and her husband has blue eyes. She knows that her children are equally likely to have brown or blue eyes. What is the probability that her first child will have blue eyes? If her first child has brown eyes, what is the probability that the second child will have blue eyes?

Answer 1

Let B = Brown (dominant) and b = blue (recessive)

Lavonne's genotype is Bb, because dad has bb.

Use Punnett square for Bb (Lavonne) and bb (husband)

https://www.google.com/search?client=safari&rls=en&q=punnett+square&ie=UTF-8&oe=UTF-8&gws_rd=ssl

Each birth is independent, so it does not effect subsequent births.