Question about mendelian inheritance

Practice Question Solving
1

Question 308:
Which of the following apply to Mendelian inheritance?

  1. It only applies to plants.
  2. It treats different traits as either dominant or recessive.
  3. Heterozygotes have a 25% chance of expressing a recessive trait.
  4. 1 only
  5. 2 only
  6. 3 only
  7. 1 and 2
  8. 1 and 3

hey, I don’t really understand why 3 option is not correct. Could you explain it?

2

Hello!
I think why option 3 is incorrect because hetrozygotes themselves do not express recessive traits. A recessive trait is only expressed when “aa” .
I think your thought process is hetrozygotes can express 25% but that percentage only applies to offspring likelihood of being homozygous recessive. Hetrozygotes themselves have a 0% chance of expressing a recessive trait.
I might be wrong but this is my understanding on the situation I’d love for any moderators to correct me if I said anything incorrect.

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3

thank you very much, I was confused because I didnt understand the statement and thought exactly how you said

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