Question

4. Five different races within a species have the chromosomal gene order listed below. Assuming that each race evolved by a single inversion from another race, and the earliest race was nopqrst, what was the order of evolution for the 5 races?

1. nopqrst

2. nstporq

3. noptsrq

4. stpqrno

5. stponrq

a. 1→ 3 → 2 →5 → 4

b. 1→ 5 → 3 →4 → 2

c. 1→ 4 → 5 →3 → 2

d. 1→ 2 → 3 →5 → 4

. 1→ 5 → 2 → 4 → 3

Answer 1

Answer:-

Given - five different races are given (which evolved within a species).

Each race evolved by single inversion from another race.

The earliest race was nopqrst.

Order of evolution for 5 races ?

Solution :- correct order for 5 races is

a)1-3-2-5-4

Explanation :-1- nopqrst

3- nop​​​​tsrq

   ​​​​​​2- n​​​​​​​​​stporq

5- stpo​nrq

4- stp​qrno

Chromosomal inversion :- occurs when an chromosome breaks at two points and get reinserted in the reverse orientation.

In above correct order we can observe that how a chromosome breaks at point and get reinserted in reverse orientation.