Gamete Genotype % a+ b+c+ 12.9 a bc 13.5 a+ b+c 6.9 a bc+ 6.5 a+ bc 26.4 a b+c+
ID: 4857 • Letter: G
Question
Gamete Genotype
%
a+ b+c+
12.9
a bc
13.5
a+ b+c
6.9
a bc+
6.5
a+ bc
26.4
a b+c+
27.2
a b+c
3.1
a+ bc+
3.5
total= 100.0
· Whichgametes are known to have been involved in double crossovers andhow do I tell?
· Whichgamete types have not been involved in any exchanges? How doI tell?
· The ordershown is not necessarily correct, which gene locus is in themiddle? How do I tell?
Gamete Genotype
%
a+ b+c+
12.9
a bc
13.5
a+ b+c
6.9
a bc+
6.5
a+ bc
26.4
a b+c+
27.2
a b+c
3.1
a+ bc+
3.5
total= 100.0
Explanation / Answer
- the two most frequent phenotypes arethe parents - the two least frequent phenotypes arethe double recombinants - the middle four phenotypes are thesingle recombinantsQuestion 1
The gametes that are known to have beeninvolved in double crossovers are the ones with the two leastfrequent phenotypes, so those would be [a b+ c] and [a+ bc+].
Question 2
The games that have not been involved inany exchange are the ones with the parental phenotype, which arethe ones that appear most frequently, so they would be [a+ b c] and[a b+ c+].
Question 3
To find which gene is in the middle,compare the parents with the double recombinants. Two of thealleles will match two alleles of one of the parents, the one thatdoes not match is the gene that is in the middle.So...
Parents: [a+ b c] [a b+ c+]
Double Recombinants: [a b+ c] matches [a b+ c+] with thealleles a and b+ [a+ b c+] matches [a+ b c] with thealleles a+ and b
Alleles c+ and c are not involved in thistwo-allele match, so that means that gene C is in themiddle.
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