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WorksheetsUnit 6 Genetics & Natural Selection
Total questions: 25
Worksheet time: 13mins
Which part of DNA structure is responsible for the variation we see within and among organisms?
the arrangement of the sugar molecules
the arrangement of the nitrogen bases
the arrangement of the phosphate molecules
the arrangement of the deoxyribose molecules
Which of the following is an example of a trait inherited from parents?
lung cancer
attached earlobes
preference for spicy food
short hair
Describe the relationship between genes, chromosomes, and DNA.
DNA is made up of pieces of chromosomes that contain genes
Chromosomes are regions on a gene made of DNA
Genes are sections of DNA located within chromosomes
DNA is made up of chromosomes found on genes
In order for a gene mutation to be passed down to offspring, in what type of cell must it occur?
It must occur in a muscle cell
It must occur in a blood cell
It must occur in a uterine cell
It must occur in a gamete
Amino Acids are joined together in cells to make:
Carbohydrates
Proteins
Phosphoric Acids
Fatty Acids
Genes are located in which part of a cell?
the nucleus
the cytoplasm
the cell membrane
the ribosomes
What is a gene?
It is the combined effect of all of the DNA that a person has
It is a mutation in DNA that causes diseases
It is a trait, like the shape of our earlobes
It is a unit of DNA that is responsible for making one protein
When the diversity of a population increases, the likelihood of survival increases because
The animals reproduce more than a less diverse population
Not as many animals die of natural causes
More animals are likely to survive a variety of potentially harmful situations
The variety of traits causes all beneficial mutations
Dark peppered moths increased in numbers during the industrial revolution because
The pollution caused the moths to become dirty
The pollution caused the moths to mutate and become dark
The birds could no longer see the light moths in the darker forests
The birds could no longer see the dark moths in the dark forests
How is fitness defined when it comes to "survival of the fittest?"
the ability of an organism to survive in most environments
the ability of an organism to survive in its own environment
the strongest and fastest organisms in an environment
the most diverse populations of organisms in an environment
If you build a model of DNA, which rule should you follow:
Adenine pairs with thymine, and guanine pairs with cytosine
Adenine pairs with guanine, and cytosine pairs with thymine
Adenine pairs with cytosine, and thymine pairs with guanine
Adenine pairs with either guanine, cytosine or thymine
Over many generations, mutations have occurred to the harmless California king snake that have caused it to resemble the poisonous western coral snake. Analyze the impact of this mutation on the organism.
The mutation is most likely beneficial
The mutation is most likely harmful
The mutation is most likely neutral
The mutation is not passed down from parent to offspring
Which of the following objects could be used to model the structure of a DNA molecule?
a snowflake
a ladder
a cube
a branching tree
What is the genetic contribution of parents to offspring?
Both parents give all their genetic information to their offspring
Each parent gives half of their genetic information to their offspring
Female parents donate all their genetic information, and male parents donate half
The parents genetic contributions are random, with unpredictable amounts from each parent
A mutation occurs that results in one protein's amino acid being substituted by a different amino acid. What part of a DNA molecule was affected by this mutation?
A nitrogen base pair
A sugar molecule
A phosphate molecule
A sugar molecule, phosphate molecule, and nitrogen base pair
Which of the following statements are correct?
Genes alone determine the characteristics of organisms
Organisms have the same characteristics as their parents
A combination of genes and environment determine the characteristics of organisms
Environment alone determines the characteristics of organisms
What determines the order in which amino acids are assembled into proteins?
the order of genes on a chromosome
the arrangement of chromosomes in a cell
the order of the three nitrogen bases in an RNA codon
the number of nitrogen bases in the DNA molecule
Why do we have chromosomes instead a one long linear strand of DNA?
it is easier to transcribe the DNA in a chromosome
it would take up too much room
the RNA cannot be formed in a long line
the strand would get tangled
Odors that repel, spines, poisonous chemicals, and thorns are all considered...
adaptations that enhance survival
traits that oppose natural selection
characteristics associated to fossils
only physical appearances
Certain antibiotics are no longer effective against the bacteria that they are used to kill. How could this be explained?
The number of bacteria is now greater than what the antibiotic can kill
The antibiotic has become weaker over time
Bacteria that were resistant to the antibiotic survived to reproduce
Changes in the environment made antibiotics ineffective
A walking stick is an insect that looks like a twig. How does this adaptation help the walking stick to survive?
It is small so it needs to eat less food
It is able to stay cooler
It usable to run after prey faster in the trees
Its appearance makes it difficult fro predators to see it
DNA consists of:
two backbones made of alternating sugar and nitrogen base molecules, with phosphate molecules joining both backbones
a single backbone made of alternating sugar and nitrogen bases, with phosphate molecules branching off the sugar molecules
a single backbone made of alternating sugar and phosphate molecules, with nitrogen bases branching off the sugar molecule
two backbones of alternating sugar and phosphate molecules, with nitrogen bases connecting both backbones
Scientists change the genes of a tomato plant to produce a protein that is a natural pesticide. Justify why this is classified as a positive mutation.
This demonstrates that scientists are able to manipulate an organism's genes
The plant will develop a symbiotic relationship with insects
The plant will be resistant to insects, increasing its chances of survival
This may cause a decrease in the genetic diversity of the tomato plant
Which is not a lifestyle choice?
genetics
drugs
alcohol
tobacco
The front leg of a cat, the front flipper of a dolphin and the wing of a bat have the same structure and order of bones. These structures do not look alike and are not used in the same way, but the bones are similar. What could scientists say about the cat, bat and dolphin based on this evidence?
They may share a common ancestor
They all live in an aquatic environment
They have completely different ancestors
They all have the ability to fly
