Suppose that black hamsters were found to be 70% of the population and the gray hamsters 30% of the population. Calculate the percentage of BB, Bb, and bb hamsters in the next generation.

- I don't know how to calculate the percentage of the genotypes.

a google search showed:

This is a Hardy-Weinberg type question.

The population is composed of RR, Rr, and rr individuals.

To figure out genotypic frequencies, it's a matter of multiplying out the frequencies.

Hardy-Weinberg says that the population frequencies are RR: 2Rr : rr or RxR: 2 x R x r: r x r.

You have .7*.7:2*.7*.3:.3*.3
= .49 : .42 : .09

Not sure how this relates to the frequencies in the next generation . . .

BB (Homozygous dominent) 25% and Bb (heterozygous dominent) 50% and bb(homozygous recessive.so phenotypic ratio is 3:1 and genotypic ratio is 1:2:1

To calculate the percentage of genotypes in the next generation, we need to consider the principles of Mendelian genetics. In this case, let's assume black is represented by the dominant allele "B" and gray is represented by the recessive allele "b".

Given that black hamsters are 70% (0.7) of the population and gray hamsters are 30% (0.3) of the population, we can assign probabilities to each genotype:

1. BB genotype (black hamsters): Since black hamsters are completely black, they must have received a dominant allele "B" from both parents. Since "B" is dominant, both alleles must be "B". Therefore, the frequency of BB genotype is 0.7 * 0.7 = 0.49 or 49%.

2. Bb genotype (heterozygous black-gray hamsters): To calculate the frequency of Bb genotype, we need to consider that the black hamsters would be either BB or Bb. The probability of a black hamster being Bb is 1 minus the probability of being BB: 1 - 0.49 = 0.51 or 51%.

3. bb genotype (gray hamsters): The gray hamsters can only have the recessive allele "b" from both parents since gray is the result of two recessive alleles. Therefore, the frequency of bb genotype is 0.3 * 0.3 = 0.09 or 9%.

So, in the next generation, the percentages of BB, Bb, and bb hamsters would be approximately 49%, 51%, and 9%, respectively.