If a plant with a genotype of Aa is self-crossed, how many combinations would produce homozygous recessive offspring?

a. Four
b. One
c. Two
d. None


b. One

If a plant with a genotype of Aa is self-crossed, only one combination would produce offspring with both recessive traits aa.

Biology & Microbiology

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Photosynthetic organisms of the open oceans are confined to the upper  

A.  two hundred millimeters. B.  two hundred centimeters. C.  two hundred meters. D.  two hundred kilometers. E.  two thousand kilometers.

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Which of the following treatments would enhance the level of the Pfr form of phytochrome?

A) exposure to far-red light B) exposure to red light C) a long dark period D) inhibition of protein synthesis E) synthesis of phosphorylating enzymes

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The light-sensitive pigment found in animals' eyes is called

A. carotene. B. chlorophyll. C. glutamate. D. rhodopsin. E. tyrosine.

Biology & Microbiology

Which class of genes controls the developmental identity of segments along the anterior-posterior axis?

What will be an ideal response?

Biology & Microbiology