Crossing over occurs in prophase of meiosis 1 crissing over results in

A) new combinations of genes on a chromosome

b) genetically identical homorogous chromosome

C) double the number of original chromosome

D) half the number of original chromosome

Enhancer I can stimulate the transcription of gene A, but the insulator blocks its effect on gene B Enhancer ll can stimulate the transcription of gene B, but the insulator blocks its effect on gene A What would be the effect of moving the insulator

Why is it important to perform test on a control urine sample?

According to the principle of stratigraphy which layer in a rock formation would you expect to be the oldest

What happens when ATP supplies energy for thin filaments in a muscle fiber to slide over the thick filaments? A. The muscle contracts. B. The muscle relaxes. C. The muscle both contracts and relaxes. D. The muscle neither contracts nor relaxes

After Karl Lashley trained rats to solve a maze, he removed pieces of their cortex. He reported that, no matter what part of the cortex was removed, the rats retained partial memory of how to solve the maze. This indicates that:

How many cells does a fish have? Do they maintain homeostasis?

What types of reproductive isolation may have been important in galápagos finch speciation? a. geographic isolation and temporal isolation b. geographic isolation and behavioral isolation c. behavioral isolation and temporal isolation d.

The loss of the ability of the larynx to produce normal speech sounds is called:

Explain how a blood glucose concentration of 7.5 mmol dm-3 would be brought back to normal in the body of a mammal and why this is a negative feedback mechanism

What is the salinity of ocean water