7th Grade Unit 4 Test Corrections

Hydra reproduce by a process known as budding, as shown in the diagram below.

This process is the formation of a new individual that is a clone of the parent. This type of reproduction is —

• sexual

• sporulation

• asexual

• binary fission

What would be a possible disadvantage of asexual reproduction?

• Ability to reproduce in the absence of a mate.

• Results in low genetic variation of the species.

• Allows for more genetic variation in the offspring.

• Takes less time to produce offspring.

Sexual reproduction —

• results in genetic variation in the offspring

• produces offspring that are identical to the parent

• decreases the chances of survival of the species

• results in genetic material being donated to offspring by only one parent

In sexual reproduction, how many genes does an offspring receive for each trait?

• 1

• 2

• 3

• 4

The diagram below represents different processes involved in reproduction. Which diagram(s) represent sexual reproduction?

• II and III

• III only

• I, II, and IV

• I and II

Female Komodo dragons can reproduce using a process called parthenogenesis. Parthenogenesis is a form of asexual reproduction where an unfertilized egg develops into an offspring.

Which of the following is an advantage of offspring formed from parthenogenesis?

• The genetic diversity is increased in the offspring.

• A population can form in a new area from an individual organism.

• Offspring are more resistant to disease than their parent.

• Members of the population are genetically similar.

Which scenario is likely to result in the most diverse offspring?

• Asexual reproduction by budding

• Asexual reproduction by binary fission

• Sexual reproduction between two individuals in the same population

• Sexual reproduction between two individuals from different continents

What is an advantage of offspring produced from sexual reproduction?

• Offspring may be unfit for the environment in which they are formed.

• Traits are consistently conserved from generation to generation.

• Offspring are able to have more advantageous traits than their parents.

• Offspring are smaller and more active than their parents.

Which of the following scenarios of reproduction is most likely to form uniform offspring?

• Pollen from one flower pollinates an egg of another flower to produce seeds.

• A female fish lays unfertilized eggs in a river, and the male arrives later to fertilize the eggs.

• Spores are formed from two cells, each from individual fungi organisms.

• An amoeba splits during binary fission into two separate cells.

Which of the following scenarios of reproduction is most likely to form diverse offspring?

• A female cat’s body collects sperm cells from multiple mates and uses the cells all at once to generate a litter.

• A bacteria cell replicates exponentially in a nutrient rich environment to generate a large colony.

• A scientist cuts a branch off of a tree and applies a root growth hormone to cause the branch to grow into a mature tree.

• An individual hydra produces a bud which breaks off of the animal to form a new adult.