Polymeric and pleiotropic action, gene interaction problems
Answers are for parents and teachers.
1
Compare polymeric action and pleiotropy.
In polymery many genes — one trait; in pleiotropy one gene — many traits.
2
A₁a₁A₂a₂ × A₁a₁A₂a₂ gave 3200 wheat plants. About how many are white (a₁a₁a₂a₂)?
200
3
From BbEe × bbee 160 puppies were born. About how many are brown (bbE_)?
40
4
Why is human height determined by many genes and the environment rather than one gene?
Height is a quantitative trait: several genes add up, and nutrition and health also have an effect.
5
Yellow mouse × yellow mouse gave 24 live young. About how many are yellow?
16