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Simple Mathematical Rules Useful in Working Genetics Problems

Description
Simple Mathematical Rules Useful in Working
Genetics Problems
Crosses between Organisms Heterozygous for Genes Exhibiting
Number of
Heterozygous
Gene Pairs
LON—‘3
4
Independent Assortment
Number of
Different Types
of Gametes
Formed
2H
2
4
8
16
Number of
Different
Genotypes
Produced
3n
3
9
27
81
Number of
Different
Phenotypes
Produced*
2n
2
4
8
16
*The fourth column assumes a simple dominant—recessive relationship in each
gene pair.
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