Use the punnett squares below to model each parent combination after filling in each Punnett square predict then percentages of black and white offspring

The provided question is incomplete as it lacks the combinations of parent as metion in the question, however the complete question is attached as the image.

There are two parent combinations that are :

1. heterozygous black Ff cross with heterozygous black Ff

2. heterozygous black Ff cross with white ff

Explanation:

1. in first combination the each parent will produce F and f gametes, as it is shown as Capital F so it will be dominant over f as per the rule. so the cross can be shown as :

    F      f

F  FF    Ff

f  Ff     ff

where, FF are black Ff black and ff white offspring. As there is clearly 3 black offspring over one white spring so the ratio is 3:1 or 75% chances of black and 25% chances of white offspring (phenotype).

2. in second combination there would be F and f gametes for black parent and f and f for white parent, thus the offsprig would be :

    F     f

f   Ff    ff

f   Ff    ff

As, there is two black and two white springs are produced than the ratio would be 2:2 or 50% chances of each white offspring and black offspring (phenotype)

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.