contestada

A widow's peak hairline is dominant (W) to a straight hairline (w). Karen and her brother both have a straight hairline, but her parents and sister all have a widow's peak.

How would this look in a Punnett square?

Respuesta :

Answer:

Phenotypes are the physical characteristics that result from the genotype, which is the genetic makeup of the organism. In this case, either straight hairline or Widow's peak will be the phenotype, as they are the physical characteristics being discussed.

The questions states that a Widow's peak is dominant over straight hairline. So we are going to assume that the Widow's peak allele is W (dominant), and the straight hairline allele is w (recessive).

A dominant allele will mask the presence of a recessive allele unless both of the alleles are both recessive (both ww).

So for the WW genotype, we are going to see the dominant phenotype: Widow's peak.

For the Ww genotype, we are also going to see the dominant phenotype since the dominant allele is going to mask the presence of the recessive allele, so we are going to see: Widow's peak.

Lastly, for the ww genotype, we are going to now see the recessive phenotype, since both alleles are recessive: straight hairline. Note that their are two of these type of offspring as stated in the question.

and a) WW - Widow peaked offspring

b) Ww - Widow peaked offspring

c) ww - straight  hairline offspring

Explanation:

luisvaschetto

Karen and her brother both have a genotype 'ww' (phenotype straight hairline), whereas the father and sister have a genotype 'Ww' (phenotype peak hairline).

  • A Punnett square is a representation of how different gametes combine to produce distinct genotypes from a given genetic cross.

  • A Punnett square is very useful to decipher the possible expected genotypes and phenotypes of a given genetic cross.

  • In this case, the father will be heterozygous 'Ww', thereby producing two types of gametes: W and w, whereas the mother will be homo-zygous 'ww', producing only one type of gamete: w.

  • The Punnett square here is:

                  W         w

          w     Ww      ww

          w     Ww      ww

In conclusion, Karen and her brother both have a genotype 'ww' (phenotype straight hairline), whereas the father and sister have a genotype 'Ww' (phenotype peak hairline).

Learn more in:

https://brainly.com/question/3522181