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Assume That a and B Are Two Linked Genes on an Autosome

question 63

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Assume that A and B are two linked genes on an autosome in Drosophila. A testcross is made where AB/ab flies are crossed to ab/ab flies and the progeny are counted and shown below. However, it is known that the Aa/bb genotype is lethal before the flies hatch and does not appear among the testcross progeny counted. What is the most precise map distance between the two genes that can be calculated from these data? Aa Bb = 235
Aa bb = 225
Aa Bb = 20

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Definitions:

Principal

The main party to a transaction, such as a buyer or seller in a contract, or an individual who empowers another (agent) to act on their behalf.

Contract Authority

A power granted to an individual or entity to enter into legally binding agreements on behalf of another person or entity.

Principal Duties

are the main responsibilities or tasks that an individual or entity is expected to perform as part of a job role or contractual agreement.

Agent Duties

Responsibilities of an agent to act in the best interest of the principal, including duties of loyalty, care, and to disclose material information.

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