QUESTION 1 refer to the following all is d is home to nique

QUESTION 1 refer to the following: all is d is home to nique population of land ils. This populatio ded by 10 individ Is that floated to the is log nd it has been isolated the larg land population consistently had about 10,000 individuals in it through time. The island population reached 1000 individuals after several generations, and then stayed at this size through time. A team of researchers co the genetic variation of the meinend snd the iso (atedisland popularions for few generations after colonization, Would e biologist agree or disagree with the folowng statements questions r-Mu Genetic drift is more pronounced in the island popuation than the mainland population inth ese first few generations o Agree O Disagree QUESTION 2 The biologists abserved genetic drift but nat O Agree O Disagree QUESTION 3 The island population likely has fewer alleles-that is versions of genes-than the mainland population O Agree O Disagme QUESTION 4 Some harmful traits may have become more common in the island population than the mainland pol pulation. O Agree O Disagree QUESTION 5 Arar forty gan ns, biologis sumo ths genarice variatian of tha isolataolisand dpopulatian again. They conchuded that the population of snais on the island had emained solated and rhar genetic dnfthad occured. Would 6 biologist agree or disagree with the folowing statements (questons 5-7 aoout The fact that snail buted to genetic drit. needed to adjust to the environment O Agree O Disagree land population ha 1 points saved points points Save Answer

Solution

1. Genetic drift is most pronounced in island populations - Agree

2. The biologists observed genetic drift but not evolution - Agree

3. The island population has fewer alleles than mainland population - Agree

4. Some harmful traits may have become more common in island population - Agree

5. The fact that snails needed to adjust to the new environment contributed to genetic drift - Agree

6. The fact that individuals best suited to the environment had higher rate of survival contributed to genetic drift - Agree

7. Random survival of different individuals could not have contributed to genetic drift because random processes are unpredictable. - Disagree

8. The island population may have adapted to conditions on the island through genetic drift - Agree

Reasons:

Genetic drift changes the gene frequency in small populations purely by chance. When the size of the population is small, some genes may be reduced in frequency or even lost by chance and others may be increased in frequency by chance. Let us take a population of 10 individuals consisting of 9 MM and 1 mm. Then the percentage of the genes is 90% M and 10% m. If by chance the mm individual dies, there is a complete loss of the gene m from the population and gene M is increased by 100%.

Genetic drift tends to preserve or destroy genes without distinction, whether favourable, neutral or unfavourable. Hence genetic drift is a force working in opposition to natural selection. Natural selection preserves only favourable genes and destroys unfavourable genes. Genetic drift is a force of chance or probability. Hence it works irrespective of the adaptive value of the traits. As a result unfavourable or non adaptive traits come into existence. When Hardy Weinberg equilibrium is maintained, the rate of evolution is zero. But in small populations the equilibrium is upset by genetic drift.