In mendel's experiment, why did wrinkled seeds show up in the f2 generation, even though they were not present in the f1 generation? a. the f2 generation was homozygous. b. the f1 generation carried recessive alleles. c. the f2 generation carried only dominant alleles. d. the f1 generation was homozygous.

B. The F1 generation carried recessive alleles.

Explanation: Recessive alleles are able to express only when these alleles are present in homozygous state. This means that only two recessive alleles together can show the respective phenotype. In F1 generation, since the genotype was heterozygous, for eg Rr, it was expressing the dominant trait only, i.e. round seeds. But after selfing of Rr and Rr in F2 generation, rr was formed. That is why, F2 contained wrinkled seeds.

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.