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There are six people in the Fisher family. Olivia and Marcus are the parents. They have four children: Violet, Nathan, Jonas, and Claudia.

Neither Olivia nor Marcus have freckles.

What is Olivia's genotype?
What is Marcus' genotype?
What is the probability that each child has of inheriting freckles?
Both Marcus and Olivia are heterozygous for the hairline trait.

What is the probability that each of their children could inherit a widow's peak?
What is the probability that each of their children could inherit a straight hairline?
What is the probability that each of their children could be homozygous dominant for the trait?
Neither Marcus nor Olivia can roll their tongues.

How many of their children could be born with the ability to roll their tongues?
How many of their children could be hybrids?
What is the genotype of the whole family?
All four children have dimples.

What is likely the genotypes of their parents?
Do we know with certainty that one of the parents has to have dimples?
Both Olivia and Marcus are EE for the earlobe trait.

Among their children, what is the ratio of free earlobes to attached earlobes?
What percentage of the children are homozygous?
Marcus can not detect the bitter taste. Olivia has been found to be able to detect the bitter taste, but she is heterozygous for the trait.

What is the probability that each of their children could taste the ptc paper?
If Violet can not taste the ptc paper, what is Violet's genotype?
Given what you know, how many of the family can taste the ptc paper?

Respuesta :

marianaegarciaperedo

Answer and Explanation:

A) The allele for freckles is dominant (F), so if Neither Olivia nor Marcus has freckles, then their genotypes are recessive homozygote for the trait, this is "ff."

          1) Olivia genotype: ff

          2) Marcus genotype: ff

          3) 100% of their children will be recessive homozygote for the freckles gene, ff.

B) Hairline gene: Widow peak allele is dominant -W- over the strait hairline allele which is recessive -w-. Both Marcus and Olivia are heterozygous for the hairline trait, so both their genotypes are Ww for the trait.

  1. The probability of getting children with a widow's peak is 75% or 3/4 of probability, (WW or Ww).
  2. The probabilities for children to inherit strait hairline is 25% or 1/4 (ww).
  3. The probability for the children to be homozygous dominant (WW) is 25% or 1/4.

C) Tongue´s roll trait: Tongue rolling is a dominant trait, T. Neither Marcus nor Olivia can roll their tongues, so their genotypes are tt.

  1. None of their children will be born with the ability to roll their tongues.
  2. None of their children will be hybrids, because both their parents are homozygous recessive for the trait.
  3. The genotype of the whole family is "ww".

D) Dimple is dominant. There are high possibilities of getting the dimples dominant allele in a family that already express the trait.

  1. If the four children have dimples, this means that both their parents could be dominant homozygote for the trait, "DD" or that one of them is homozygote and the other is heterozygote, "Dd", or that one of them is dominant homozygote "DD" and the other one is recessive homozygote "dd".
  2. But one they must have dimples.

E) Free-lobule trait, E, is dominant over the attached-lobule trait, e.  Both parents are EE, homozygous dominant for the trait.  100% of the progeny will be homozygous dominant free lobules, EE. The ratio of free lobes to the attached lobes is 1 to 0.

F) The ability to taste bitter is dominant, T. So if Marcus cannot detect bitter taste, he is recessive homozygote for the trait, "tt". Olivia is a heterozygote for the trait, this is "Tt".

  1. The probability that each of their children could taste the PTC paper is 50% or 2/4.
  2. If Violet can not taste PTC paper her genotype is "tt".
  3. The number of individuals that can taste PTC is 4 over 6.
mickymike92

Based on genotype and phenotypes;

  • Olivia's genotype is ff
  • Marcus' genotype is ff
  • probability of their children inheriting freckles is 0
  • Probability of children having widow's peak (WW or Ww) = 3/4
  • probability for children with straight hairline, ww = 1/4.
  • probability for the children to be h0m0zygous dominant (WW) = 1/4
  • None of their children will have ability to roll their tongues.
  • None of their children will be hybrids
  • The genotype of the whole family is tt.
  • either both their parents could be dominant h0m0zygote for the trait, "DD" or
  • one of them is h0m0zygote and the other is heterozygote, "Dd", or
  • one of them is dominant h0m0zygote "DD" and the other one is recessive h0m0zygote "dd".
  • one of the parents must have dimples.
  • ratio of free lobes to the attached lobes is 1 to 0.
  • 100% of the progeny will be h0m0zygous dominant free lobules, EE.
  • probability each of their children could taste the PTC paper is 1/2.
  • Violet's genotype is tt.
  • number of individuals in the family that can taste PTC paper is 3.

What is the phenotype of Marcus and Olivia?

The allele for freckles is dominant (F).

If neither Olivia nor Marcus has freckles, then their genotypes are recessive h0m0zygote for the trait, ff.

Therefore;

  • Olivia's genotype is ff
  • Marcus' genotype is ff
  • Since , they are both recessive h0m0zygote for the freckles gene, ff, the probability of their children inheriting freckles is 0.

What is the probability of hairline traitand Widow's peak?

Widow peak allele,W is dominant over the strait hairline allele, w.

Both Marcus and Olivia are heterozygous, Ww for the hairline trait.

The probability of having children with a widow's peak:

  • Ww × Ww = WW, Ww, Ww, ww.

Probability, of widow's peak (WW or Ww) = 3/4

The probability for children with straight hairline, ww = 1/4.

The probability for the children to be h0m0zygous dominant (WW) = 1/4

What is the probability of tongue rolling trait?

Tongue rolling is a dominant trait, T.

Neither Marcus nor Olivia can roll their tongues, so their genotypes are tt.

tt × tt = tt, tt, tt, tt

Therefore;

None of their children will have ability to roll their tongues.

None of their children will be hybrids.

The genotype of the whole family is tt.

What is the probability of dimples?

Dimple is a dominant trait.

The four children have dimples.

Therefore,

  • either both their parents could be dominant h0m0zygote for the trait, "DD" or
  • one of them is h0m0zygote and the other is heterozygote, "Dd", or
  • one of them is dominant h0m0zygote "DD" and the other one is recessive h0m0zygote "dd".

Thus,one of the parents must have dimples.

What is the probability of free or attached earlobes?

Free-lobule trait, E, is dominant over the attached-lobule trait, e.

Both parents are EE, h0m0zygous dominant for the trait, EE.

The ratio of free lobes to the attached lobes is 1 to 0.

100% of the progeny will be h0m0zygous dominant free lobules, EE.

What is the probability of tasting PTC?

The ability to taste bitter is dominant, T.

Marcus cannot detect bitter taste, so he is recessive h0m0zygote for the trait, "tt".

Olivia is a heterozygote for the trait, this is "Tt".

Tt × tt = Tt, Tt, tt, tt.

The probability that each of their children could taste the PTC paper is 1/2.

Violet can not taste PTC paper, therefore her genotype is tt.

The number of individuals in the family that can taste PTC paper is 3.

Learn more about genotype and phenotype at: https://brainly.com/question/15726066

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