The pattern of gap formation may influence species diversity.

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#Question id: 10992

#Unit 7. System Physiology – Animal

When recording lead aVL on an EKG, the positive electrode is the

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#Question id: 2433

#Unit 2. Cellular Organization

All types of myosins

a. bind and hydrolyze ATP.               

b. bind actin filaments.

c. form dimers.                       

d. contain an associated myosin light chain.

e. move toward the (+) end of an actin filament.

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#Question id: 4359

#Unit 3. Fundamental Processes

DNA methylation and histone acetylation are examples of which of the following processes?

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#Question id: 27553

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is responsible for the generation of amino acid Alanine, Cysteine, Glycine, Threonine, Tryptophan, Serine

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#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?