The diagram represents part of Mendel's pea plant experiment. He crossed white-flowered pea plants with purple-flowered pea plan
ts. Flower color has the same type of heredity as pea color.
What was most likely the result of the experiment?
a)one plant with white flowers and three with purple flowers
b)one plant with purple flowers and three with white flowers
c)four plants with white flowers
d)four plants with purple flowers
What was most likely the result of the experiment?
a)one plant with white flowers and three with purple flowers
b)one plant with purple flowers and three with white flowers
c)four plants with white flowers
d)four plants with purple flowers
2 answers:
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The correct answer is 9:3:3:1
When two homozygotes for two traits cross, the phenotypic ratio of the offspring is 9:3:3:1 ( unless other factors like epistatic interaction change the inheritance model).
In our case, we have two simple traits of seed color and seed shape that follow the Mendelian model of inheritance.
In this dihybrid cross, we have
9/16 of the offspring expressing both dominant traits ( yellow and round seeds)
3/16 expressing one dominant and one recessive trait ( yellow and wrinkled)
3/16 expressing the other dominant and recessive trait (green and round)
1/16 expressing both recessive traits ( green and wrinkled)
When two homozygotes for two traits cross, the phenotypic ratio of the offspring is 9:3:3:1 ( unless other factors like epistatic interaction change the inheritance model).
In our case, we have two simple traits of seed color and seed shape that follow the Mendelian model of inheritance.
In this dihybrid cross, we have
9/16 of the offspring expressing both dominant traits ( yellow and round seeds)
3/16 expressing one dominant and one recessive trait ( yellow and wrinkled)
3/16 expressing the other dominant and recessive trait (green and round)
1/16 expressing both recessive traits ( green and wrinkled)