Question

Suppose a researcher performed an experiment to determine the number of genes affecting fruit size in tomatoes. She crossed a domesticated, heirloom tomato plant with a wild tomato plant for two generations to obtain F2 individuals. In the parental lines, the domesticated tomatoes had a fruit diameter of 17 cm and the wild tomatoes had a fruit diameter of 5 cm.

If fruit size is an additive genetic trait, what number of genes should we expect to contribute to this phenotype? Use the data below. Your answer should be expressed numerically (no words).

Height |
Number of individual plants |

5 cm | 1 |

7 cm | 4 |

9 cm | 16 |

11 cm | 22 |

13 cm | 15 |

15 cm | 5 |

17 cm | 1 |

The relative fitness of the
*A*^{1}*A*^{1} genotype is 1.0, the
relative fitness of the
*A*^{1}*A*^{2} genotype is 0.8, and
the relative fitness of the
*A*^{2}*A*^{2} genotype is 0.6. The
*A ^{1}* allele should
["stay the same", "increase", "decrease"]
in the next generation, and
it is likely
["incompletely dominant", "completely dominant"]
with respect to the

Answer #1

Suppose in pumpkins there are five genes that work additively to
affect pumpkin size. A homozygous lower case allele pumpkin,
aabbccddee, weighs 20 lbs. Each capitalized allele additively
affects the final phenotype by adding one pound from the base
pumpkin size. What would the maximum expected size be for pumpkin
offspring produced from the cross between a parent with genotype
AaBBCcddEE and a parent with genotype AABbccDDEe? Group of answer
choices
22 lbs
28 lbs
30 lbs
26 lbs
24...

Part I. You are investigating the evolution of
cuticle color in a scarab beetle inhabiting a desert. Coloration is
determined by a single gene A with two alleles:
A1 codes for a dark brown
color, and A2 codes for a grey
color. Since the alleles are incompletely dominant,
heterozygotes are tan. Therefore
the heterozygotes are almost invisible on the sandy desert floor,
while homozygotes are more visible and thus more susceptible to
predation.
Questions: (a) Based on the given information,...

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