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Is there a relationship between the frequency of a trait in a population and whether that trait is dominant or recessive?
Wiki User
∙ 12y ago
Some observable traits in humans are dimples, earlobes, tongue-rolling, cleft chin, hairline, and freckles. The relationship between the frequency of a trait in a population and whether the trait is dominant or recessive because in inherited human traits, the offspring can either have dimples or no dimples.
Wiki User
∙ 12y ago
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What is an example of allele frequency?
An example of allele frequency is when in a population of 100 individuals, 60 individuals have the dominant allele (A) for a specific gene, while 40 individuals have the recessive allele (a). The frequency of the dominant allele (A) would be 0.6, and the frequency of the recessive allele (a) would be 0.4.
In the Hardy Weinberg equation shown below P is the frequency of the dominant allele and q is the recessive allele?
Homozygous recessive genotype
In one allele is dominant to a recessive allele?
In a dominant-recessive allele relationship, the dominant allele will be expressed phenotypically over the recessive allele. This means that even if an organism carries one dominant and one recessive allele for a particular trait, the dominant allele will determine the observable characteristic.
Can two dominant genes equal a recessive gene?
No, two dominant genes cannot equal a recessive gene in terms of genetic expression. In a dominant-recessive gene relationship, the dominant gene will be expressed over the recessive gene.
Dose a frequency trait help determine if the trait is dominant or recessive?
Because it has things
What would happen is selective pressure changed and the recessive gene was selected for?
If selective pressure changed and the recessive gene was selected for, individuals carrying the recessive gene would have a higher chance of surviving and reproducing, leading to an increase in the frequency of that gene in the population. Over time, this could result in the recessive gene becoming the dominant trait in the population.
The Hardy-Weinberg formula and what each of the terms mean?
formula: p2 + 2pq + q2 = 1 p+q=1 p = dominant (A) allele frequency q = recessive (a) allele frequency q2 = homozygous recessive frequency p2 = homozygous dominant frequency 2pq = heterozygous frequency
How does genetic information pass unchanged from one generation to the next even when a specific trait is not exhibited?
This is a principle of population genetics based on the Hardy-Weinberg Principle. A trait that is neither selected for nor against will remain in the population at the same frequency. In most populations the frequency values can be back calculated from the percentage of the population that is homozygous recessive. The basic equations are p+q=1 and p (squared) + 2pq + q (squared)=1 The value of q (squared) is the frequency of homozygous recessive individuals in the population. So if 20% of the population is homozygous recessive, then q (squared) is .20. This makes q=.45 (approx.) So, in order to produce a population where 20% of all individuals are homozygous recessive a full 45% of all the alleles at that gene locus are recessive. p=.55 p+q=.55+.45=1.0 Now all the numbers for the homozygous dominant and heterozygotes can be calculated. The approximate percent of the population that is homozygous dominant is 30% with 50% of the population represented by heterozygotes. .3+.5+.2=1 As the gene frequency for an allele decreases the less likely two individuals that are heterozygous for the trait will be to breed and produce either a homozygous recessive individual or a homozygous dominant. In the case where a characteristic is dominant and has a low frequency, the trait will be seen in family lines but rarely has the opportunity to be passed beyond a small population because there is no selection for the characteristic. An example of this is 6 fingered (polydactyl) individuals, which is a dominant trait. They exist in the population but they are rarely seen.
Can you determine whether an allele is dominant or rescessive on the basis of the ratio of the phenotypes in the population?
No, the determination of whether an allele is dominant or recessive is based on the inheritance pattern of the traits. Dominant alleles are expressed in the phenotype even if only one copy is present, while recessive alleles are only expressed when two copies are present. Phenotype ratios in a population can hint at the presence of dominant or recessive traits but do not definitively determine the dominance relationship of an allele.
Can recessive genes become dominant?
Recessive genes do not become dominant. Dominant genes mask the expression of recessive genes in the presence of both alleles. However, if a recessive gene is selected for over time through breeding, it can become more prevalent in a population.
What is the answer for the Hardy Weinberg equation?
p2 + 2pq + q2 = 1 and p + q = 1p = frequency of the dominant allele in the populationq = frequency of the recessive allele in the populationp2 = percentage of homozygous dominant individualsq2 = percentage of homozygous recessive individuals2pq = percentage of heterozygous individuals
What can be dominant or recessive?
Alleles can be dominant or recessive
