Lab Report: Genetic Crosses 2
Part 1: incomplete dominance—predicting flower color in snapdragons.
Snapdragons are popular garden plants that produce brightly colored flowers. When a plant that is homozygous for white flowers is crossed with a plant that is homozygous for red flowers, all offspring are pink. Snapdragons are an example of a plant that exhibits an inheritance pattern called incomplete dominance.
1 . Determine the genotype of each parent plant and write them below. Use W to indicate the allele for white flowers and w to indicate the allele for red flowers.
Genotype of homozygous parent plant with white flowers:
Genotype of homozygous parent plant with red flowers:
2 .Next, think about the gametes each parent plant will produce. List the allele in each gamete.
Parent plant with white flowers:
Parent plant with red flowers:
3. The two parent plants are the P generation, or parent generation. Create a Punnett square to show their offspring, the F1 generation.
4. What pattern do you notice in the genotypes of the F1 generation snapdragons?
5 . What are the phenotypes of the F1 generation snapdragons?
1 Expert Answer
Kelsey K. answered • 11/21/19
Science and Math Tutor
Genotype of homozygous parent plant with white flowers: WW
Genotype of homozygous parent plant with red flowers:ww
The pink offspring would be Ww. Generally, you would learn that the WW or Ww would be white, but because the W isn't 100% dominant over w, the flower is pink. Basically, the plant requires two copies of W to make enough red pigment to appear red.
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