B b B BB Bb
b Bb bb

B = brown eyes b = blue eyes

According to the Punnett Square shown above
A.
there is a 75% probability that an offspring will have blue eyes and a 25% probability that an offspring will have brown eyes.

B.
there is a 75% probability that an offspring will have brown eyes and a 25% probability that an offspring will have blue eyes.

C.
there is a 50% probability that an offspring will have brown eyes and a 50% probability that an offspring will have blue eyes.

D.
there is a 100% probability that an offspring will have one brown eye and one blue eye.

B

Explanation:

there is a 75% probability that an offspring will have brown eyes and a 25% probability that an offspring will have blue eyes.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.