Keystone Review Module B-Units 6-7

Multiple Choice

The genetic material of two different individuals of the same species is analyzed. One individual has brown eyes the other has blue eyes. Which characteristic for eye color would be the same for both individuals?

• THE ALLELE

• THE DNA SEQUENCE

• THE AMOUNT OF PIGMENT

• THE LOCATION OF THE GENE

Multiple Choice

A specific genetic disorder is caused by nondisjunction. Which statement describes how the genetic disorder occurs?

• A problem with RNA replication leads to gametes

  with extra chromosomes

• A problem with chromosome separation leads to gametes

  with damaged chromosomes.

• Incomplete DNA replication leads to gametes

  with half the usual number of chromosomes.

• Incomplete chromosome separation leads to gametes

  with an abnormal number of chromosomes.

Multiple Choice

An inversion occurs along part of a chromosome.

How does the inversion most likely affect the region in which it occurs?

• Recessive alleles in the region become dominant alleles.

• The information in the region is read

  differently during transcription.

• The coding sequence in the region disappears from the cell.

• Multiple frame shift errors in the region are

  triggered after translation

Multiple Choice

An individual of a plant species shows a certain physical characteristic that require two copies of the same allele to be expressed. based on this information, how would the allele for the characteristic of most likely be classified?

• RECESSIVE

• DOMINANT

• SEX-LINKED

• POLYGENIC

Multiple Choice

A trait in cows is determined by two alleles of a single gene: allele R is dominant, and allele r is recessive. What is the probability of the dominant trait being expressed in the offspring of one RR parent and one rr parent?

• 25%

• 50%

• 75%

• 100%

Multiple Choice

A scientist observes that a certain trait is determined by a single allele. An organism inherited one version of the trait from one parent and another version from the other parent. Both versions of the trait are expressed in the phenotype of the offspring. Which pattern of inheritance best classifies The observed trait?

• DOMINANCE

• SEX-LINKAGE

• CO-DOMINANCE

• INCOMPLETE DOMINANCE

Multiple Choice

Blood type is inherited through multiple alleles, including the ‘A’ allele (AA or Ai), the ‘B’ allele(BB or Bi) and the ‘O’ allele(ii). 

A child has type A blood. If the father has type AB blood, what are all the possible phenotypes of the mother? 

• phenotypes O or A

• phenotypes A or AB

• phenotypes A, B, AB

• phenotypes O, A, B, AB

Multiple Choice

Genetic engineering has led to genetically modified plants that resist insect pests and bacterial and fungal infections.

Which outcome would most likely be a reason why some scientists recommend caution in planting genetically modified plants?

• Unplanned ecosystem interactions

• Reduced pesticide and herbicide use

• Improved agricultural yield and profit

• Increased genetic variation and diversity

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Multiple Choice

A group of students measured a ten-square-meter section of a pond ecosystem and recorded observations.

Which statement is a testable hypothesis?

• The frogs living in the pond represent a population

• Water is an abiotic component in the pond ecosystem

• If the fish are given more food, then they will appear happier

• If the frogs are startled, then they will jump into the water

Multiple Choice

The graphs illustrate change in a lizard population over time.

Which process most likely led to the change in the lizard population?

• natural selection acting on a harmful trait

• natural selection acting on a beneficial trait

• natural selection acting on a dominant trait

• natural selection acting on a recessive trait

Multiple Choice

A mutation occurs in the genes that code for coat color in deer.

Which change will most likely result from this mutation?

• A change in the selection pressures acting on coat color

• A change in the coat color genes of deer predator species

• An increase in coat color diversity in the population

• An increase in the number of genes for coat color in the population

Multiple Choice

The skeletons of mammalian forelimbs represent variations of a structure that was present in their common ancestor.

What has most likely caused the variation in forelimbs?

• changes in muscle structure

• changes in the genetic codes

• trait formation due to behaviors

• development of vestigial structures

Multiple Choice

Analyze the graph on the right, what type of isolation is occurring that allows these frog species to remain separate?

• GEOGRAPHIC

• BEHAVIORAL

• TEMPORAL

• MECHANICAL

Multiple Choice

In North America, the eastern spotted skunk mates in late winter, and the western spotted skunk mates in late summer.

Even though their geographic ranges overlap, the species do not mate with each other. What most likely prevents these two species from interbreeding?

• 1. Habitat isolation

• 1. Gametic isolation

• 1. Geographic isolation

• 1. Reproductive isolation

Poll

Congratulations!

You have finished Units 6-7 Review! Genetics & Evolution!

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If you need further review- check out the Keystone Review Resources in your Biology Schoology course. You can also replay this lesson as many times as you need to! Link is in the review folder.