Model: Use the Punnett squares below to model each parent combination. After filling in each Punnett square, predict the percentages of black and white offspring. Parent 1: Heterozygous black (Ff) Parent 2: Heterozygous black (Ff) Predicted % black offspring: Predicted % white offspring: Parent 1: Heterozygous black (Ff) Parent 2: Homozygous white (ff) Predicted % black offspring: Predicted % white offspring:

cross 1: 75% black    25% white    

cross 2: 50% black  50% white offspring    

Explanation:

Cross 1

Heterozygous black  x    heterozygous black

            F        f  

F         FF       Ff

f          Ff        ff  

75% black    25% white    

Cross 2

Heterozygous black x   homozygous white

          F         f

f        Ff        ff

f        Ff        ff

50% black  50% white offspring        

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

can i pls have the choices?