# Homework Help: Another bio question

1. Feb 19, 2006

### f4d_girl

Hi... I just completed this assignment but i'm not sure if i did it correctly or not.. can someone review my assignment?

9. Hand- in question: A brown-eyed man whose father was brown-eyed and whose mother was blue-eyed married a woman whose father and mother were both brown-eyed. The couple has a blue-eyed son. For which of the individuals mentioned can you be sure of the genotypes? What are their genotypes? What genotypes are possible for the others?

1 = brown eye man
2 = his father
3 = his mother
4= his wife
5= wife’s father
6 = wife’s mother
7 = brown eyed man’s son

1 = Bb
2 = B? / he can be Bb or BB
3 = bb
4 = b? / she can be bb or Bb
5 = B? / he can be Bb or BB
6 = B?/ she can be Bb or BB
7 = bb

However, one should note that wife’s father and mother, both cannot be BB because the son is blue-eyed meaning that the wife is blue-eyed.

2. Feb 19, 2006

### Moonbear

Staff Emeritus
Everything is fine until your last sentence. As you got correct in #4, the wife has one allele for blue eyes, but could be either homozygous or heterozygous, so you cannot know if she is blue-eyed or brown-eyed.

3. Feb 19, 2006

### Ouabache

Yes i concur, it looks good up to your last line. But you already stated correctly in #4 that "his wife" is either bb or Bb. You also already know that Bb is brown eyes (as in #1) and bb is blue eyes (as in #7). So I suspect your last sentence was an oversight.

Although you solution does summarize the information needed to answer your questions, I suspect you are not going to hand in your answer in this form. Often teachers would like to see each question addressed individually.

Last edited: Feb 19, 2006