Question

GENETIC ANALYSIS OF F1 AND F2 GENERATIONS
ID Number Name Sex Generation Gene 1 Gene 2 Gene 3 Gene 4 Gene 5 Gene 6 Gene 7
SF03-07 Yin F F1 191/203 215/233 334/366 218/250 277/309 150/162 178/196
SF03-06 Yang F F1 177/199 227/229 334/338 214/218 269/285 150/162 168/182
SF06-10 Ping F F1 199/227 213/237 362/362 246/246 285/293 150/150 158/160
SF97-02 Pong F F1 189/197 227/227 334/350 218/234 297/313 150/162 194/196
SF06-11 Jaws M F1 197/223 201/233 350/366 234/250 277/281 150/150 182/202
SF12-12 Quinn F F2 197/197 227/227 334/334 218/218 313/313 162/162 196/196
SF13-109 Grace F F2 199/199 227/227 334/334 218/218 269/269 150/150 182/182
SF13-243 Ariel F F2 189/189 227/227 350/350 234/234 313/313 150/150 194/194
Making Sense of the Data
Working with your group, closely observe and analyze the data to draw conclusions
about the new shark pups’ parentage. For each F2 offspring in the table above,
determine the following:
ƒ Who is the mother?
ƒ Is Jaws the father?

Answer 1

Short answers
- Quinn — mother = Pong. Jaws is NOT the father.
- Grace — mother = Yang. Jaws is NOT the father.
- Ariel — mother = Pong. Jaws is NOT the father.

Reasoning (brief)
- All three F2s are homozygous at every locus, so each parent must carry that same allele.
- Quinn (197,227,334,218,313,162,196): Pong is the only F1 female carrying 197 (G1) and she also carries 227, 334, 218, 313, 162 and 196 — so Pong is the mother. Jaws lacks 227 at Gene 2 (he is 201/233), so he cannot have contributed the 227 allele → not the father.
- Grace (199,227,334,218,269,150,182): intersection of loci points to Yang (Yang has 199, 227, 334, 218, 269, 150, 182) → Yang is the mother. Jaws does not carry 199 at Gene 1, so he cannot be the father.
- Ariel (189,227,350,234,313,150,194): Pong carries all of these alleles, so Pong is the mother. Jaws lacks 189 (G1) and 194 (G7), so he cannot be the father.

Therefore none of the three F2s can have Jaws as sire based on the genotypes shown.