your phone holds whats called a photo stream- 30 days worth of pictures (or last thousand) and then they roll off.
when you take new pics, they get uploaded to your photo stream and then downloaded by any other device you are signed in to the same apple ID with. if you have a mac and are using iphoto to import the photos, this creates an backup of the photos.
The following quote is directly from the article I linked you-
"Your iOS devices keep a rolling collection of your last 1000 photos in the My Photo Stream album. From there, you can browse your recent photos or move the ones you like to your Camera Roll or another album to keep them on your device forever."
so, if you delete a pic thats in your camera roll and not necessarily your photo stream, no this isnt reflected on the mac.