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Ap bio help. Genetics question?
Suppose a fictional bird is real, and this bird has eight separate genes for tail length per haploid genome, with each gene having to alleles. One allele for each gene (a1, b1, and so on) increases the length by 1 cm, whereas the other allele (a2, b2, and so on) increases it by 0.5 cm. If a bird has the genotype a1a1b2b2c1c2d1d2e2e2f1f2g1g1h1h2, then what is the length of its tail? Please show the process used for getting the answer.
Thanks!
1 Answer
- Ms. WorthLv 77 years agoFavorite Answer
1) Count the number of alleles that are in the form of x1
a1 a1 <-- 1, 2
b2 b2
c1 c2 <-- 3
d1 d2 <-- 4
e2 e2
f1 f2 <-- 5
g1 g1 <-- 6, 7
h1 h2 <-- 8
There are 8 alleles of the type x1
Therefore there must be 8 more alleles which would be of the type x2
(because there are 16 alleles in all -- two for each gene)
8 x1-type alleles @ 1.0 cm ea = 8 cm
8 x2-type alleles @ 0.5 cm ea = 4 cm
-------------------- -------------------- ---------
Total .......... .......... ......... ........ 12 cm <-- answer
Answer: The tail is 12 cm long
(That's about 4½ inches.)
Extra Credit -- the band-tailed pigeon
This real bird has a tail about that long, but of course its genes are not like the ones in the problem.
