Genetic Observations Through The Studies Of Hybrid Corn, Single Gene Human Traits, And Fruit Flies

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traits
for the P generation, F1 generation, and F2 generation. The P generation is the
original true-breeding parents. Their hybrid offspring is the F1 generation,
the first filial. The F2 generation is the second filial and is the self-
pollination of the F1 hybrids. It was predominantly his research on the F2
generation that led to Mendel�s Law of Segregation and Law of Independent
Assortment (Campbell, 1996).
Mendel�s Law of Segregation states that alleles sort into separate
gametes. He formed this through performing monohybrid crosses. The F2
generation will have a 3:1 phenotypic ratio. By considering more than one trait
Mendel formed his Law of Independent Assortment. He questioned whether traits
were inherited independently or dependently. By performing dihybrid crosses he
found that genes are independent and will form all possible combinations .
Crossing two different traits resulted in a 9:3:3:1 phenotypic ratio (Campbell,
1996).
Thomas Hunt Morgan also had ...

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of 497, and an expected value of 451.5; and su=
wrinkled seeds with an observed value of 105, and an expected value of 150.5.
The chi-squared value was 18.35, this value didn�t correspond with any of the
given probability values. The Null hypothesis with a 3:1 phenotypic ratio was
rejected (see figure 1). Hence, the observed number of smooth seeds versus
wrinkled seeds is not different from the expected 3:1 ratio for a monohybrid
cross (see table 1).
A dihybrid cross was used to find the genotypes of potential offspring
regarding two traits. The offspring possibilities were SuP=smooth, purple seeds
with an observed value of 577 and an expected value of 617.6; Sup=smooth, yellow
seeds ...

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