This equation represents 

TLS Online TPP Program

#Question id: 14735

#Unit 2. Cellular Organization

Large surface are a to volume ratio of bacterial cell give advantage for

TLS Online TPP Program

#Question id: 24630

#Unit 2. Cellular Organization

Part of genome which changes expression of genome called as

TLS Online TPP Program

#Question id: 10963

#Unit 7. System Physiology – Animal

During an inflammatory response, which is the correct order for cellular events?

TLS Online TPP Program

#Question id: 3613

#Unit 8. Inheritance Biology

When a single gene influences more than one trait it is called

TLS Online TPP Program

#Question id: 15834

#Unit 8. Inheritance Biology

You are interested in a new type of autosomal dominant mutation that gives purple eyes in Drosophila. You have a true-breeding purple-eyed line carrying a mutation that you call pr-1. You have isolated a second purple-eyed mutation that you call pr-2, which you have established in a true-breeding line that also carries a recessive marker st, which gives stubby legs. You cross a fly from the pr-1 line to a fly from the st, pr-2 line producing F1 females which you then cross to males from a true breeding st line (normal eyes). From this cross, 1000 progeny flies can be categorized into four different phenotypic classes:

                             

Normally, 3-factor crosses give eight different phenotypic classes, why does this particular cross give only four?