Biology Forum › Genetics › how many genetically different eggs could be formed?
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- April 19, 2007 at 6:52 pm #7455
bradpittaParticipantI 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 =2b) 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? 🙁 - April 19, 2007 at 11:08 pm #71315canalonParticipant
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?
- April 20, 2007 at 2:36 am #71318bradpittaParticipant
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?
- April 20, 2007 at 4:24 am #71325Dr.SteinParticipant
Shortcut: 2^n, which n = number of heterozygous
Aa Bb Cc Dd —> n = 4, genetical variations = 2^4 = 16
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