Bash while loop script that runs Nmap with iterating IP and port number - bash

Question

Summary: I'm trying to create a Bash script that selects an IP address and it's associated open ports, then run each IP through Nmap and display/store the results.
The format of the ports file (portsList):
192.168.1.1 53 udp
192.168.1.1 80 tcp
192.168.1.1 1900 tcp
192.168.1.110 135 tcp
192.168.1.115 1080 tcp
The format of the IP file (ipList):
192.168.1.1
192.168.1.110
192.168.1.115
My Bash script:
#!/bin/bash
portsvar="$(cat formattedPorts)"
hostvar="$(cat oneHost)"
while read -r line;
do
echo "$line" > oneHost
grep -wf oneHost portsList | awk '{print $2}' | tr '\n' ',' > formattedPorts
nmap -n -sV -p"$portsvar" "$hostvar" >> scanResults
cat scanResults
done < ipList
I spent several hours, trying multiple variations of this code and tried to find a solution online. But to no avail. The most this script can do is scan and output for the first selected IP and ports.
Additional considerations would be; if a port is UDP, to append 'U:' on the ports option. Also, if there is a way to display the output of Nmap scanning, while it is being redirected '>>' to a file.
Bash is what I'm most familiar with, but I'm open to learning a solution in a different language.
Edit
I tried jhnc's solution below by replacing:
echo "$line" > oneHost
grep -wf oneHost portsList | awk '{print $2}' | tr '\n' ',' > formattedPorts
nmap -n -sV -p"$portsvar" "$hostvar" >> scanResults
cat scanResults
with jhnc's code in the comment below. the resulting output was:
nmap -n -sV -p T:135 192.168.1.110
nmap -n -sV -p T:5985 192.168.1.112
nmap -n -sV -p T:54112,T:60000,T:8009,T:8888 192.168.1.131
nmap -n -sV -p T:5040 192.168.1.132
nmap -n -sV -p T:1041,T:1900,T:20005,T:33344,T:49152,T:49153,T:80 192.168.1.1
This output was echo'ed onto the terminal 5 times. From this I'll try to find a solution to have the input of this group of IP's ran once.