A zebrafish biologist isolates 4 mutants, named z1, z2, z3, and z4. When homozyg
ID: 35079 • Letter: A
Question
A zebrafish biologist isolates 4 mutants, named z1, z2, z3, and z4. When homozygous, all the mutants have a long, long tail and no head, and then die the next day. Since all the mutants are lethal they are carried as heterozygote stocks and carriers are identified before doing experiments. (An indentified individual from the the z1 stock would be z1/+.) He makes the following crosses:
(complement or not?)
Stock WT mutant (C or NC ?) Complete the table:
z1 x z2 730 0 _______
z1 x z3 330 99 _______
z1 x z4 603 0 _______
z2 x z3 840 0 _______
z2 x z4 76 22 _______
z3 x z4 550 0 _______
a) How many genes are there? ______Invent names for your genes:
b) Assign the alleles to your genes in the style your-gene-name zX
Explanation / Answer
Stock WT mutant (C or NC ?) Complete the table:
z1 x z2 730 0 ___NC____
z1 x z3 330 99 ___C____
z1 x z4 603 0 ___NC____
z2 x z3 840 0 ___NC____
z2 x z4 76 22 ___C____
z3 x z4 550 0 _NC______
a) How many genes are there? ___3___Invent names for your genes:
b) Assign the alleles to your genes in the style your-gene-name zX: X-X-, X-X-, X+X+, X+X+
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