Genetic Diversity Flashcards
genetic diversity
the amount of genetic variation across an entire species
population
a group of a species that lives in a defined area at a specific time
Mutation
a permanent, random change in part of an organism’s DNA
Select the correct answer.
Scientists are monitoring a local snake species. The species went through a rapid habitat change when some of the grassy meadows they lived in were cleared for new buildings. The snakes have three distinct color variations: green, brown, and black.
The chart shows the number of snakes before and after the event:
Before Habitat Change One Year After Habitat Change
green 7,556 1,293
brown 5,264 3,948
black 6,450 6,321
Scientists noted that most populations of these snakes around the world have experienced similar habitat changes. What do you predict for this species as a whole?
Choices
The green snake will be less and brown and black will win
the brown and black will die
they will all die
The green snake will be less and brown and black will win
What’s the percentage of organisms that survived?
A natural disaster caused a population of 4,695 organisms to migrate to a new habitat. A few generations after the disaster, it was observed that the new habitat did not support the survival of the species. The table shows the population of the species in the two habitats.
Original Habitat New Habitat
4,695 2,326
Based on the table, the population in the new habitat is about 50 percent of the original population.
Which statements about sex-limited traits are true?
Genes for the trait are present in both genders.
Growing a beard in males is an example of a sex-limited trait.
The traits aren’t expressed physically.
Developing green eyes is an example of a sex-limited trait.
Select all the correct answers.
Earthquake damage causes two rabbits to be separated from the rest of the rabbits in their large habitat. They have no way to get back to their original habitat. The two rabbits mate with each other. Over time, all the offspring in the new habitat are descendants of the original two rabbits. What are the outcomes of this situation?
The rabbits in the new habitat will have lower genetic variation than the rabbits in the original habitat.
The rabbits in the new habitat will have a higher risk of random genetic mutations than the rabbits in the original habitat.
The rabbits in the original habitat have a greater likelihood of choosing an unrelated mate than the rabbits in the new habitat.
The rabbits in the original habitat will be less likely to reproduce than the rabbits in the new habitat.
