Recessive Alleles Lab Report
Introduction:
The process of evolutionary change occurs at the level of the population. A population is a group of interbreeding individuals located in the same area and separated physically from other populations of the same species. The genotype of a population is called its gene pool and consists of all of the alleles present in the population members for all of the genes found in that species. Evolutionary change occurs when there is a measurable change in the population's genotype through time. Alleles are alternative versions of gene. An allele is said to be lethal if it directly causes death of the organism. A lethal recessive allele must be inherited from both parents to cause death; offspring must have two such (homozygous) recessive …show more content…
Follow the steps below:
Step 1: Count out 60 normal gene alleles (white beads) and 40 lethal alleles (black beads) into the tub provided.
Step 2: Stir the gene as demonstrated by the instructor (this represents independent assortment) and let them roll down to one edge of the tub. Every two genes, an allele pair, will represent an individual.
Step 3: Determine the number of individuals inheriting two lethal alleles, one from each parent. These individuals are nonviable.
Step 4: Remove these individuals from the population by removing two lethal alleles for each dead individual.
Step 5: Calculate the resulting percentages of homozygous normal and heterozygous normal individuals (white beads), and lethal individuals (black beads) in the population. Record the results.
Step 6: To be able to continue the experiment for further generations, the population must be first restored back to 50 individuals. For example, if 20 lethal genes were removed from the population, replace these with 20 normal genes so the population will remain at 50 individuals throughout the generations.
Step 7: Repeat this for nine more generations, recording the data for each
The process of evolutionary change occurs at the level of the population. A population is a group of interbreeding individuals located in the same area and separated physically from other populations of the same species. The genotype of a population is called its gene pool and consists of all of the alleles present in the population members for all of the genes found in that species. Evolutionary change occurs when there is a measurable change in the population's genotype through time. Alleles are alternative versions of gene. An allele is said to be lethal if it directly causes death of the organism. A lethal recessive allele must be inherited from both parents to cause death; offspring must have two such (homozygous) recessive …show more content…
Follow the steps below:
Step 1: Count out 60 normal gene alleles (white beads) and 40 lethal alleles (black beads) into the tub provided.
Step 2: Stir the gene as demonstrated by the instructor (this represents independent assortment) and let them roll down to one edge of the tub. Every two genes, an allele pair, will represent an individual.
Step 3: Determine the number of individuals inheriting two lethal alleles, one from each parent. These individuals are nonviable.
Step 4: Remove these individuals from the population by removing two lethal alleles for each dead individual.
Step 5: Calculate the resulting percentages of homozygous normal and heterozygous normal individuals (white beads), and lethal individuals (black beads) in the population. Record the results.
Step 6: To be able to continue the experiment for further generations, the population must be first restored back to 50 individuals. For example, if 20 lethal genes were removed from the population, replace these with 20 normal genes so the population will remain at 50 individuals throughout the generations.
Step 7: Repeat this for nine more generations, recording the data for each