You are growing pea plants. You know that a single PW controls whether the peas
ID: 179682 • Letter: Y
Question
You are growing pea plants. You know that a single PW controls whether the peas are smooth or wrinkled. You also know that the allele for smooth peat it dominant (A) while the allele for wrinkled peas, is recessive When you cross two parent plants with unknown genotypes, you find that 50% of the offspring hate smooth peas and 50% hate wrinkled peas. Fill in the Punnett Square below with the GENOTYPES of both parents and the GENOTYPES of the offspring Population genetics In your greenhouse, you have 20 pea plants. The allele for yellow peas is dominant (Q) and the allele for green peas is recessive (q). Five of the pea plants have green peas. Fifteen of the pea plants have yellow peas. How many of the pea plants have a HOMOZYGOUS RECESSIVE genotype? If ten of the fifteen pea plants with yellow peas are HOMOZYGOUS DOMINANT and five are HETEROZYGOUS, then how many Q alleles and how many q alleles are there in the ENTIRE greenhouse population of 20 plants (including the plants with green peas)? If the population is in Hardy-Weinberg equilibrium, then by definition the net generation of pea plants will have the same frequency of genes and alleles as the parent generation. Name one condition that would cause the population NOT to be in Hardy- Weinberg equilibrium.Explanation / Answer
Answer:
3a). qq = 5
The frequency of green peas (qq) = 5/20 = 0.25
The frequency of green allele (q) = 0.5
As p + q = 1
p= 1-q = 1-0.5 = 0.5
The frequency of yellow allele (Q) = 0.5
The frequency of homozygous yellow peas (QQ) = 0.5 * 0.5 = 0.25
The yellow pea plants = 0.25 * 20 = 5
3b).
10 QQ = 10Q + 10Q = 20Q
5 Qq =5Q + 5q
5 qq = 5q + 5q = 10q
Total Q allele =25
Total q alleles= 15
3c). The following conditions cause the population not be in Hardy-weinberg equilibrium
1.
mutation is not occurring
2.
natural selection is not occurring
3.
the population is infinitely large
4.
all members of the population breed
5.
all mating is totally random
6.
everyone produces the same number of offspring
7.
there is no migration in or out of the population
1.
mutation is not occurring
2.
natural selection is not occurring
3.
the population is infinitely large
4.
all members of the population breed
5.
all mating is totally random
6.
everyone produces the same number of offspring
7.
there is no migration in or out of the population
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