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In a population of fruit flies, the R allele confers regular red eye colour whi…

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Wize University Biology Textbook > Evolution

Hardy-Weinberg Equation

7 Activities

Wize University Biology Textbook > Mendelian Genetics

Incomplete Dominance, Co-Dominance

3 Activities

In a population of fruit flies, the R allele confers regular red eye colour while the r allele produces white eye colours. The R gene produces a red pigment, the recessive allele of this gene (r) is nonfunctional. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have white eyes, 90 have normal red eyes and 45 have pink eyes.
More Hardy-Weinberg Equation Questions:
Which of the following populations is likely undergoing assortative mating?
40 MM, 20 Mm, 40 mm
10 MM, 80 Mm,10 mm
HWE
A population of birds contains 16 animals with pink tail feather and 34 with red tail feathers. Red tail feather are dominant. Please give answers with only 2 decimal places.
How would an extremely small population size affect a Hardy-Weinberg equilibrium?
Cystic fibrosis is a recessive genetic disease that mostly affects the afflicted lungs in its ability to transport sodium and chloride ions across the epithelium leading to thick, mucous secretions in the airways. In a certain population 1 of every 3300 children are affected.
a) What is the genotypic frequency of the diseased condition?
b) What is the genotypic frequency of the homozygous healthy condition?
Consider a population that has homozygous dominants, AA, and homozygous recessive
aa.The genotypic frequencies are AA: 60% and aa: 40%.
a) What are the allele frequencies of A and a? (A, a)
A proportion of porcupines may have long quills (dominant) or short quills (recessive).Long quilled animals are LL or Ll while short quilled at ll. The frequency of LL is 0.35.
a) What is the frequency of heterozygous rabbits?
b) What is the frequency of the L allele?
Consider a population that has homozygous dominants, AA, and homozygous recessive aa. The genotypic frequencies are AA: 60% and aa: 40%.
a) What are the allele frequencies of A and a? (p, q)
b) What will the next generation genotypic frequencies be (p2, 2pq, q2) ? Allele frequencies (p, q)?
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
a) What type of dominance do these alleles show?
b) Is this population in Hardy-Weinberg equilibrium?
Consider a population that has homozygous dominants, AA, and homozygous recessive aa. The genotypic frequencies are AA: 60% and aa: 40%.
a) What are the allele frequencies of A and a? (p,q)
b) What will the next generation genotypic frequencies be (AA,Aa,aa)? Allele frequencies(p,q)?
A population of bird contains 16 animals with pink tail feather and 34 with red tail feathers. Red tail feather are dominant.
a) What is the frequency of the red allele?
b) What is the frequency of the pink allele?
A proportion of porcupines may have long quills (dominant) or short quills (recessive). Long quilled animals are LL or Ll while short quilled at ll. The frequency of LL is 0.35.
a) What is the frequency of heterozygous rabbits?
b) What is the frequency of the L allele?
Consider a village population that is in HWE. Suppose that 36% of the people cannot smell asparagus in urine, which is a recessive trait. What percentage of the population must be homozygous for the ability to smell asparagus?
Consider a population that has homozygous dominants, AA, and homozygous recessive aa. The genotypic frequencies are AA: 60% and aa: 40%.
a) What are the allele frequencies of A and a? (p, q)
b) What will the next generation genotypic frequencies be (p2, 2pq, q2) ? Allele frequencies (p, q)?
a) If the genotype AA, Aa and aa have frequencies of 0.50.5, 0.250.25, and 0.250.25respectively, what are the allelic frequencies?
b) After a single generation of random mating, what is the expected genotypic frequencies?
Practice: Hardy-Weinberg Equilibrium
We have 100 pea plants with the following genotypes: 60 plants are AA, 20 plants are Aa, and 20 plants are aa. Is the population in Hardy-Weinberg equilibrium? (check your work against the solution)
Practice: Hardy-Weinberg Equilibrium
The percentage of the homozygous recessive genotype (aa) in a population is 36%. Calculate the following:
Practice: Relative Fitness
Given the following genotype ratios in a population, which genotype has the highest relative fitness?
49% QQ, 42% Qq, 9% qq
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
Is this population in Hardy-Weinberg equilibrium?
Which of the following is not an assumption of Hardy-Weinberg rule?
Consider a village population that is in HWE. Suppose that 36% of the people cannot smell asparagus in urine, which is a recessive trait. What percentage of the population must be homozygous for the ability to smell asparagus?
HWE
A population of bird contains 16 animals with pink tail feather and 34 with red tail feathers. Red tail feather are dominant. Please give answers with only 2 decimal places.
Which of the follow does not result in a departure from Hardy-Weinberg equalibrium?
Cystic fibrosis is a recessive genetic disease that mostly affects the afflicted lungs in its ability to transport sodium and chloride ions across the epithelium leading to thick, mucous secretions in the airways. In a certain population 1 of every 3300 children are affected.
You are observing a population of pigs where the B locus controls pig colour with two alleles B1 and B2, there are so many pigs in this population that we can ignore the effects of genetic drift.You note that the starting frequencies of B1 and B2 are 0.7 and 0.3, respectively. Under which situation would B2 reach a frequency of 1 and B1 would disappear completely in the population?
WB1B1 > WB1B2 < WB2B2
WB1B1 < WB1B2 < WB2B2
You are a geneticist studying a population of birds. You are interested in the G locus that determines the birds eye colour. You capture and observe 100 birds and determine that 36 have gold coloured eyes and a GG genotype; 48 have gold with flecks of green and a Gg genotype; and 16 have green eyes and a gg genotype. Which of the following can you conclude about the fitness of the genotypes in this population?
Which of the following contribute to a population being out of Hardy-Weinberg Equilibrium AND evolution of a population?
i. Assortative mating
ii. Genetic Drift
In a population of lemurs, a gene at locus “L” controls their leaping ability where LL individuals leap very well, Ll individuals leap as well as walk on the ground and ll individuals are terrible at leaping and exclusively walk on the ground. In this population you observe there are 7 LL individuals, 35 Ll individuals and 7 ll individuals. What is true about this population?
A population has the following genotype frequencies:
32% AA, 36% Aa and 32% aa
Is the population in HWE?
Which of the following will disrupt HWE?
Heterozygote advantage
Assortative mating
Which of the following populations is likely undergoing assortative mating?
40 MM, 20 Mm, 40 mm
10 MM, 80 Mm,10 mm
Given the below table, which of the following are the correct expected frequencies of BB, Bb and bb, respectively, if this population were in HWE?
Which of the following populations is undergoing non-random mating?
1. 4% AA, 32% Aa, 64% aa
2. 40% AA, 20% Aa, 40% aa
Practice: HWE
Which of the following populations are likely randomly mating at the B locus?
1. 4 BB, 32 Bb, 64 bb
2. 50 BB, 25 Bb, 25 bb
Which of the following is false regarding Hardy-Weinberg Theorum?
Which of the following would not disrupt the Hardy-Weinberg Equilibrium?
Which of the following best describes the Hardy-Weinberg Equilibrium?
If the frequency of the recessive allele in a population in Hardy-Weinberg equilibrium is 0.2, what is the frequency of the dominant allele after one round of random mating?
What is a fixed allele?
How would an extremely small population size affect a Hardy-Weinberg equilibrium?
What is true of a population not in Hardy-Weinberg equilibrium?
What is an implication of the Hardy-Weinberg equilibrium?
In a population, 80% of organisms have the dominant (CG) allele for colour (green) and 20% have the recessive allele for colour yellow (CY). After one round of random mating, the frequency of CGCG genotypes is 64%, CGCY is 32% and CYCY is 4%. What is true about this population?
More Incomplete Dominance, Co-Dominance Questions:
If you cross a red flower that is RR and another flower that is RR with a white one that is rr and all the offspring came out red and white this would an example of _____
If you cross a red flower that is RR and another flower that is RR with a white one that is rr and all the offspring came out pink this would an example of _____
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
a) What type of dominance do these alleles show?
b) Is this population in Hardy-Weinberg equilibrium?
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
a)What type of dominance do these alleles show?
b) Is this population in Hardy-Weinberg equilibrium?
In a population of fruit flies, the R allele confers regular black eye colour while the r allele produces red eye colours. Individuals that are heterozygous have pink eyes. In a population of 150 flies, 15 have red eyes, 90 have normal black eyes and 45 have pink eyes.
a) What type of dominance do these alleles show?
b) Is this population in Hardy-Weinberg equilibrium?
Assume the following dihybrid crosses where for a particular gene, A represents the dominant allele and a, the recessive allele, and for another trait, B represents the dominant allele and b, the recessive allele. Genes show complete dominance.
Assume the following dihybrid crosses where for a particular gene, A represents the dominant allele and a, the recessive allele, and for another trait, B represents the dominant allele and b, the recessive allele. Genes show complete dominance.
Practice: Multi-loci Crosses
A beetle species has the following genetic relationships:
Wing length - long (L) is sex-linked dominant to short (l) on the D chromosome
Wing colour - Blue (B) is co-dominant with black and makes purple wings (P) which are dominant to white (b)
Which of the follow does not result in a departure from Hardy-Weinberg equalibrium?
Imagine a set of genes that code for climbing speed of a sloth where there are slow, medium and fast climbers. The slow gene (S) and the fat (F) genes are the two loci that control climbing speed. If you produce a dihybrid cross of sloths from these two genes you get 9 slow, 3 medium and 4 fast.
What genotype would produce a sloth that climbs at medium speed?
If a heterozygote's phenotype lies exactly in the middle of the phenotypes of both homozygotes, what is this called?
What is unique about incomplete dominance?
We crossed a red flower (RR) with a white flower (rr) and the result was a progeny of pink flowers. We crossed flowers of F1 with white flowers (rr) and the result with brighter pink flowers, which of the following is the principle that best explains this experiment?