A scientist is studying two types of worms. Worm X has DNA identical to its parent. Worm Y has a combination of DNA from two parents. The scientist determines that one of the worms has a survival advantage over the other worm. Which statement correctly summarizes this conclusion?

Worm X reproduces asexually, which gives it genetic variation.
Worm Y reproduces sexually, which gives it genetic variation.
Worm Y reproduces asexually, which gives it more DNA.
Worm X reproduces sexually, which gives it more DNA.

What are the main differences between asexual reproduction and sexual reproduction?

Asexual reproduction requires two parents and produces non-identical offspring, while sexual reproduction requires only one parent and produces identical offspring.
Asexual reproduction requires two parents and produces identical offspring, while sexual reproduction requires only one parent and produces non-identical offspring.
Asexual reproduction requires only one parent and produces identical offspring, while sexual reproduction requires two parents and produces non-identical offspring.
Asexual reproduction requires only one parent and produces non-identical offspring, while sexual reproduction requires two parents and produces identical offspring.

Two scientists are debating how to classify a new animal species that they have discovered. They observe that the animal is capable of producing sperm.

What statement would they most likely make about the new species?

This animal produces offspring that are genetically different from itself.
This animal produces offspring that are genetically identical to itself.
This animal’s sperm will join with spores to produce offspring.
This animal’s sperm will undergo binary fission to produce offspring.

Koala bears reproduce sexually. Which statement describes how a young koala’s DNA compares to the DNA of its parents?

It has the same DNA as both parents.
All of its DNA comes from its father.
All of its DNA comes from its mother.
Half of its DNA comes from each parent.

A disadvantage of
reproduction is that offspring generally have more competition for resources, such as food and living space.

E. coli is a species of bacteria. What advantage does E. coli have over sexually reproducing organisms?

The bacteria’s offspring have differences in their DNA.
The bacteria require less energy to make offspring.
The bacteria can reproduce more slowly.
The bacteria’s offspring have to fight for resources.