Warm up 2/10

Last updated over 6 years ago

3 questions

1

The diagram shown illustrates a process that occurs during meiosis. This process results in-

the division of the cell

the reduction in the number of alleles

an increase in the number of chromosomes

an increase in genetic variation

Genetic drift is the effect of chance or luck on the survival and reproductive success of individuals. A flood kills 95% of an isolated population of white-footed mice. Which is a possible effect of genetic drift on this population?

 Only the top 1% of the surivivors will reproduce; less fit individuals will die without reproducing. 

 Traits that may not be the most fit for their environment may increase due to the bottleneck effect 

 The amount of genetic diversity will increase above pre-flood levels in a single generation 

  The new generation will inherit acquired traits from the survivors of the flood 

Ichthyosaursa were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are-

 examples of convergent evolution and adaptions to a common environment  

 examples of homologous structures and adaptions to a common ancestor 

 examples of vestigial structures 

 none of these 

The diagram shown illustrates a process that occurs during meiosis. This process results in-

the division of the cell

the reduction in the number of alleles

an increase in the number of chromosomes

an increase in genetic variation

 Genetic drift is the effect of chance or luck on the survival and reproductive success of individuals. A flood kills 95% of an isolated population of white-footed mice. Which is a possible effect of genetic drift on this population? 

 Only the top 1% of the surivivors will reproduce; less fit individuals will die without reproducing. 

 Traits that may not be the most fit for their environment may increase due to the bottleneck effect 

 The amount of genetic diversity will increase above pre-flood levels in a single generation 

  The new generation will inherit acquired traits from the survivors of the flood 

 Ichthyosaursa were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are- 

 examples of convergent evolution and adaptions to a common environment  

 examples of homologous structures and adaptions to a common ancestor 

 examples of vestigial structures 

 none of these 