Phlums have a variety of skin textures. They either completely smooth (ss), have
ID: 182214 • Letter: P
Question
Phlums have a variety of skin textures. They either completely smooth (ss), have small bumps , are covered in dimples , or the highly coveted phenotype of bumps and dimples. Having bumps (SB)or dimples (SD) is dominant over haveing smooth skin (s).
Phillipa, a phlum covered in dimples, has a problem - she is not sure if Phineas or Pharaoh is the father of her daughter Phiona (paging Dr. Phil!). Phineas has the desired phenotype of being covered with dimples and bumps, while Pharaoh only has bumps. Phiona is unlike everyone else in this scenario in that she has smooth skin. Use this information to answer the following questions.
Value: 1 How would you describe the trait of having bumps and dimples? Check AnswerExplanation / Answer
Ans. The trait of having bumps and dimples is dominant trait. But according to the observations, it can be inferred that the trait shows incomplete dominance. When a parent having homozygous dominant allele for bumps and dimpled skin texture is crossed with another parent of homozygous recessive alleles for smooth texture, it is supposed to be observed that the offsprings will have small bumps and dimples. The offspring will be expected to have heterozygous allelic combination.
Ans. As is observed, Phineas is completely covered with bumps and dimples, so Phineas is expected to have homozygous dominant alleles. Phillipa is a phlum covered with dimples, so Phillipa is having heterozygous dominant SD gene. As both the parents have dominant gene, the offsprings will have either homozygous dominant (covered with dimples and bumps) or heterozygous dominant (small dimples and bumps) genotypes. So, the possibilty of having completely smooth skin is discarded.
Therefore, the answer is No.
Ans. Pharaoh has bumps only, so Pharaoh has heterozygous dominant SB genotype. Phillipa is having heterozygous dominant SD gene. If they are crossed, at least one of the offsprings will have homozygous recessive gene. That is, one of the offsprings will have completely smooth textured skin.
So, there are maximum chances that Pharaoh is Phiona's father.
Ans. When Phillipa will be crossed with Phiona's father, that is, Pharaoh there are 50% chances of the offspring to have completely smooth skin or another 50% chances to have small bumps and dimples. This is because both the parents are heterozygous for one of the genes.
So, the answer is 50%.