The dominant allele is always the most common allele in the gene pool. What is the number of dominant alleles in a population of 100 individuals with the following genotypes: 30 BB, 60 Bb, 10 bb.
Do dominant alleles become more common over time?
In natural selection, having a certain trait makes an individual more reproductively successful than individuals lacking the trait. Thus, the allele that codes for the favored trait is passed on to more offspring, and becomes more common over time. The result: the frequency of the dominant allele goes up over time.
Which allele is more frequently found in a population quizlet?
Recessive alleles are more frequent in the population than dominant alleles.
What is always true about a dominant allele quizlet?
What is always true about a dominant allele? What is the maximum number of different alleles of a gene that an individual human can have? … Yes, if recombination occurs between the two genes during meiosis.
Is anyone dominant for every trait?
No organism has all dominant or all recessive genes. An organism may be pure in certain traits and hybrid others. Remember, that a dominant trait in one kind of organism may be a recessive trait in another organism. 1.
Are dominant or recessive alleles easier to remove by selection?
It is actually much easier to select against a dominant allele than it is to select against a recessive one, because if an individual has a dominant allele, the trait is exhibited.
What are the three ways in which natural selection can change a distribution of traits?
Natural selection on polygenic traits can affect the distributions of phenotypes in three ways: directional selection, stabilizing selection, or disruptive selection.
Which of the following conditions could mean that a population is in Hardy-Weinberg equilibrium?
The conditions to maintain the Hardy-Weinberg equilibrium are: no mutation, no gene flow, large population size, random mating, and no natural selection. … Therefore mutation, gene flow, small population, nonrandom mating, and natural selection will disrupt the equilibrium.
What are multiple alleles examples?
Two human examples of multiple-allele genes are the gene of the ABO blood group system, and the human-leukocyte-associated antigen (HLA) genes. The ABO system in humans is controlled by three alleles, usually referred to as IA, IB, and IO (the “I” stands for isohaemagglutinin).
What are the 3 alleles for blood type?
The four main blood groups A, B, AB, and O are controlled by three alleles: A, B, and O. As humans are diploid, only two of these can be present in any one genotype. In other words, only two of these alleles are present at the same time in a person’s cell.