Question

1. why are peas a good model system for studying heredity?

1. how did mendel cross - pollinate flowers?

1. what is the difference between a gene and an allele?

1. state the principle of dominance.

Explanation:

1. Peas are a good model system for studying heredity because they have easily observable traits, reproduce quickly, and can be self - pollinated or cross - pollinated.
2. Mendel cross - pollinated flowers by removing the male parts (anthers) from one flower and transferring pollen from another flower to the female part (stigma) of the first flower.
3. A gene is a segment of DNA that codes for a specific trait, while an allele is a variant form of a gene.
4. The principle of dominance states that some alleles are dominant and others are recessive. When an organism has a dominant allele and a recessive allele for a trait, the dominant allele will be expressed.

Answer:

1. Peas have easily observable traits, reproduce quickly, and can be self - pollinated or cross - pollinated.
2. Mendel removed the male parts (anthers) from one flower and transferred pollen from another flower to the female part (stigma) of the first flower.
3. A gene is a segment of DNA that codes for a specific trait; an allele is a variant form of a gene.
4. Some alleles are dominant and others are recessive. When an organism has a dominant allele and a recessive allele for a trait, the dominant allele will be expressed.