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what are the genotypic and phenotypic frequencies of offspring?

I have a test monday and I dont understand how to figure out these three sample questions.

1.If two parents were both heterozygous for a complete dominant trait, what is the probability that their child will express the recessive phenotype?

2.What are the genotypic frequencies of offspring produced by these two parents?

3.What are the phenotypic frequencies of offspring produced by these two parents?

3 Answers

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  • 1 decade ago
    Favorite Answer

    ex) parents are both AO. One will be AA, two will be AO and one will be OO theoretically in statistics. Therefore the percentages are 75% dominant phenotype and 25% recessive phenotype (0r) 1 in 4.

    1. 1:4 ratio or 25%

    2. 1 homozygous dominant; 2 heterozygous dominant; 1 homozygous recessive genotypically

    3. 3 phenotypically dominant, 1 phenotypically recessive.

    Source(s): MT(ASCP) 24 years.
  • 4 years ago

    by making use of the information accrued by making use of scientists, The egg might might desire to have got here first. The egg (which grew to become into no longer particular as a fowl egg) could have been layed by making use of yet another organism. subsequently the egg got here first. even though, in accordance to the bible, all organisms have been created by making use of G-D and subsequently the fowl got here first. the respond isn't a straight forward to work out as you may think of. The question is basically a concepts teaser that's meant to make human beings think of. The question might desire to be considered as an excersize to develop one's way of thinking rather then a debate over technological information vs faith. the way the question is think to paintings is on a "what if" situation. IF G-D did create the earth and each and all of the creatures, then the fowl got here first, yet whilst technological information is right approximately evolution, then the egg got here first.

  • 1 decade ago

    1. 25%

    2. 25%:50%:25% (homo dom:hetero:homo rec)

    3. 75%:25% (dom:rec)

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