Question

У лесной земляники красная окраска ягод доминирует над розовой и наследуется мгновенно. Определите частоты встречаемости аллелей гена окраски и генотипическую структуру, если в популяции 84% растений имеют красную окраску ягод. ???

Answer 1

Действительно решаем по закону Харди-Вайнберга.
p^2+2pq+q^2=1
Кол-во рецессивных гомозигот:
100%-84%=16% (или 0,16 если принять 100% за 1)
q^2=0,16
q=0,4
p=1-0,4=0,6
Значит частота встречаемости гена "А" - 0,6, гена "а" - 0,4.
Найдем генотипическую структуру:
AA = p^2 = 0,6^2 = 0,36 (или 36%)
Aa = 2pq = 2*0,6*0,4=0,48 (или 48%)
aa = q^2 = 0,4^ = 0,16 (или 16%).

Ответ: АА: Аа: аа = 36%:48%:16%

Answer 2

Frequencies of Alleles and Genotypic Structure in a Population of Forest Strawberries

To determine the frequencies of alleles and the genotypic structure in a population of forest strawberries with red and pink berry color, we need to use the information provided.

According to the given information, 84% of the plants in the population have red berry color. This means that the frequency of the allele for red berry color (R) is 0.84, and the frequency of the allele for pink berry color (r) is 0.16.

To calculate the genotypic structure, we can use the Hardy-Weinberg equilibrium equation: p^2 + 2pq + q^2 = 1, where p represents the frequency of the dominant allele (R) and q represents the frequency of the recessive allele (r).

Given that the frequency of the allele for red berry color (R) is 0.84, we can calculate the frequency of the recessive allele (r) as follows:

q = sqrt(0.16) ≈ 0.4

Now, we can calculate the genotypic frequencies:

- Frequency of homozygous dominant genotype (RR): p^2 = (0.84)^2 ≈ 0.71 - Frequency of heterozygous genotype (Rr): 2pq = 2 * 0.84 * 0.16 ≈ 0.27 - Frequency of homozygous recessive genotype (rr): q^2 = (0.16)^2 ≈ 0.03

Therefore, the genotypic structure in the population of forest strawberries with red and pink berry color is approximately as follows: - Homozygous dominant genotype (RR): 71% - Heterozygous genotype (Rr): 27% - Homozygous recessive genotype (rr): 3%

Please note that these calculations are based on the assumption that the population is in Hardy-Weinberg equilibrium and that there are no other factors influencing the allele frequencies.