In Drosophila,the Genes Y,f,and V Are All X-Linked Determine the Linkage Arrangement of These Three Genes and Calculate

question 58

Essay

In Drosophila,the genes y,f,and v are all X-linked.y f v females are crossed to wild-type males and the F₁ females are test-crossed.The F₂ are distributed as follows.
$$\begin{array} { | l | r | } \hline y f v & 3210 \\\hline y f + & 72 \\\hline y + v & 1024 \\\hline y + + & 678 \\\hline + f v & 690 \\\hline + f + & 1044 \\\hline + + v & 60 \\\hline + + + & \underline { 3222 } \\\hline & 10,000 \\\hline\end{array}$$
Determine the linkage arrangement of these three genes and calculate the map distances.

---

Definitions:

Sensation

The process of receiving stimulus energies from the external environment and transforming those energies into neural energy.

Cerebral Cortex

The outer layer of neural tissue of the cerebrum of the brain, involved in multiple high-level functions like perception, thought, and memory.

Parietal Lobes

Regions of the brain located behind the frontal lobes that are responsible for processing sensory information from various parts of the body, understanding spatial orientation, and managing navigation.

Occipital Lobes

Structures located at the back of the head that respond to visual stimuli.