## how many genetically different eggs could be formed?

Genetics as it applies to evolution, molecular biology, and medical aspects.

Garter
Posts: 3
Joined: Thu Apr 19, 2007 6:41 pm

### how many genetically different eggs could be formed?

I need some help solving this question from my "intro to genetics class"
How many genetically different eggs could be formed by women with the following genotypes? (a/a is albino;b/b is brown eyes;c/c curled fingernail; d/d is deaf) ?
a) A/a, b/b, C/C, D/D =2

b) A/A, B/b, C/c, d/d =4
c) A/a, B/b, c/c, D/d =8
d) A/a, B/b, C/c, D/d =16
our teacher gave these answers, but i dont know how he got them?

canalon
Inland Taipan
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Eggs will be ABCD or abcd or any combination of the 2 depending of the original genotype, OK?

So when you have a starting pair that is A/A or a/a there is only one possible combination for the gene A but when you have A/a, the egg can be A or a at this allele, so you have 2 possible eggs. Now if you had extra genes you just multiply the number of possible combination and you have your results.

Clear?
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

Garter
Posts: 3
Joined: Thu Apr 19, 2007 6:41 pm

### genetically different eggs?

how could the question be asked in a different way? i guess i just don't understand the question itself? for example, what are "genetically different eggs" and what is the genotype of the male this women are mating with? does that matter?

Dr.Stein
King Cobra
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Shortcut: 2^n, which n = number of heterozygous

Aa Bb Cc Dd ---> n = 4, genetical variations = 2^4 = 16

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