Answer:
1. If two pea plants with genotypes of Ff and ff are reproduced, the prediction of the percentage of the offspring that will have white flowers is 50% (option D).
2. Because pink snapdragon flowers are the result of incomplete dominance, the genotype that pink snapdragons would have is Ff (option A).
Explanation:
1. Knowing that in pea plants purple flowers (F) are dominant over white flowers (f), crossing a heterozygous purple-flowered pea plant and a flowering pea plant can produce a likely offspring of 50% white-flowered plants.
The cross can be represented by a Punnett square:
Ff X ff
Alleles F f
f Ff ff
f Ff ff
In the offspring can then be observed:
- Purple-flowered pea plants, heterozygous (Ff) 50%.
- White-flowered pea plants (ff) 50% (ff) 50% (ff) 50% (ff)
According to this, the prediction for an Ff X ff cross in pea plants is a 50% probability of white-flowered offspring.
2. In incomplete dominance it can be observed that heterozygous individuals show a mixture of the traits of both parents, without the predominance of one allele over the other being evident. In this case, pure dominant individuals are different from heterozygotes.
A snapdragon plant can have red and white flowers. As this is an incomplete dominance, the pink color of the flowers is a mixture of the phenotypes of red-flowered and white-flowered plants.
