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Question
Which of these BEST describes the primary goal of meiosis?
Responses
A The nucleus is divided without mutation.The nucleus is divided without mutation.
B A single cell divides into two daughter cells.A single cell divides into two daughter cells.
C All chromosomes are replicated and passed on to the daughter cells.All chromosomes are replicated and passed on to the daughter cells.
D Daughter cells are produced with only half the chromosomes of the parent cell.
D Daughter cells are produced with only half the chromosomes of the parent cell.
All of the statements EXCEPT one are true about mutations. Which statement is false?
Responses
A Mutations must be present in parents and then passed to offspring.Mutations must be present in parents and then passed to offspring.
B Mutations can be positive and produce organisms with improved traits.Mutations can be positive and produce organisms with improved traits.
C Mutations can be fatal to the organism that has a mutation, if the mutation is in a critical gene.Mutations can be fatal to the organism that has a mutation, if the mutation is in a critical gene.
D Mutations can be silent, and not affect the organism that has them, if the mutation is in a non-critical area.
A Mutations must be present in parents and then passed to offspring.
All of the following circumstances, EXCEPT ___________ can produce new combinations of genetic traits in sperm and eggs that are different from the parents.
Responses
A errors during meiosiserrors during meiosis
B errors during mitosiserrors during mitosis
C crossing over during meiosiscrossing over during meiosis
D mutations due to exposure to chemicalsmutations due to exposure to chemicals
B errors during mitosis
All BUT ONE statement describes an advantage of meiosis.
Responses
A Variation is aided by crossing-over which occurs during meiosis.Variation is aided by crossing-over which occurs during meiosis.
B Meiosis ensures daughter cells receive one allele for each gene and half the number of chromosomes.Meiosis ensures daughter cells receive one allele for each gene and half the number of chromosomes.
C Independent assortment provides a huge number of possible genetic combinations in daughter cells.Independent assortment provides a huge number of possible genetic combinations in daughter cells.
D Meiosis occurs often because it allows growth and repair of body tissues in multicellular organisms.Meiosis occurs often because it allows growth and repair of body tissues in multicellular organisms.
D Meiosis occurs often because it allows growth and repair of body tissues in multicellular organisms.
_______________, harmful or helpful, is considered to be the source for new alleles and a main contributor to the diversity of life on Earth.
Responses
A MitosisMitosis
B MutationMutation
C TranscriptionTranscription
D Translation
B Mutation
At the end of meiosis II, how does the DNA in each of the four new cells compare to the DNA from the original cell?
Responses
A half as much and genetically identical to the original cellshalf as much and genetically identical to the original cells
B twice as much and genetically identical to the original cellstwice as much and genetically identical to the original cells
C half as much and genetically variedhalf as much and genetically varied
D twice as much and genetically varied