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Question: 2 questions summer squash the fruit colours of summer squash...

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2 Questions:

Summer Squash The fruit colours of summer squash may be white, yellow, or green. The determination of the phenotypic colour is an example of dominant epistasis. White fruit is produced by a dominant epistatic allele (W). At another location on the chromosome, the allele for yellow fruit (F) is dominant over the allele for green fruit (f). The presence of the white allele hides the effect of the yellow or green alleles.

1)If a W w F f cross times W w F f cross occurs, predict the gametes:

2)predict the F1 generation offspring that will occur by creating a Punnett square,

3)provide the white : yellow : green hybrid phenotypic ratio.

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In individuals that have the autosomal dominant allele the severity of the disorder is determined by mutations in a gene carried on the X chromosome. The non severe (XN) allele is dominant over the severe (Xn) allele. In the absence of the autosomal dominant allele, the abnormality gene on the X chromosome is not expressed.

A woman with normal teeth had four children with a man with non-severe form of AI:

  • A boy was born without amelogenesis imperfecta
  • A girl was born without amelogenesis imperfecta
  • A boy was born with severe amelogenesis imperfecta
  • A boy was born with non severe amelogenesis imperfecta

Identify the parental genotypes.

Is my answer correct? XNXN_(X) XnY

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