How would you predict the expected phenotypic and genotypic ratios among the offspring of two individuals who are heterozygous for freckles (Ff) by using a Punnet square?

Gametes F f (inbred) F FF (freckles) Ff (freckles)

f Ff (freckles) ff (no (freckles) Phenotype ratio= 3:1 Genotype rartio= 1:2:1

Both the Parents are heterozygous to Freckles That is is one gene for freckles and another gene for not freckles The phenotype of the parent is freckles because of dominance Each character is governed by a pair factors/genes The two genes of a character is called alleles one member of each pair is contributed by one parent when two factors for alternate expression of a trait are brought together by fertilization only one express itself masking the expression of the other

The character that is expressed heterozygous condition is called dominant; the character that is masked is called the recessive character. Gametes always pure with the alleles

when gamete is formed ,the alternate genes segregate so that each gamete gets one of the alternative factor not both hence the gamete always pure carries either of the genes not both .

In this example parents are heterozygous to Freckles and they segregate at the time of the formation of gametes Hence bothe the parents produce two type of gametes F and f in the ratio of 50:50 When these gametes of opposite sex unite at random the resulting individuals will be 1. homozygous freackle 2 hetrozygous freckle 1, homozygous non freckle Hence Phenotype ratio= 3:1 Genotype rartio= 1:2:1