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.
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 organis
Parents can pass on chromosomes to their children that are different than their own when the new gene combinations are created by
Responses
A crossing over of sister chromatids during meiosis.crossing over of sister chromatids during meiosis.
B crossing over of sister chromatids during mitosis.crossing over of sister chromatids during mitosis.
C crossing over of homologous chromosomes during mitosis.crossing over of homologous chromosomes during mitosis.
D crossing over of homologous chromosomes during meiosis.m that has them, if the mutation is in a non-critical area
.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 chemicals
All of the following are effects of crossing over of homologous chromosomes during prophase I of meiosis with the EXCEPTION of
Responses
A increased genetic variety.increased genetic variety.
B increased number of chromosomes in the offspring.increased number of chromosomes in the offspring.
C the appearance of new phenotypes in the offspring.the appearance of new phenotypes in the offspring.
D possible harmful mutations from cross-over errors.
Naturally occurring methods of recombining DNA within a species to increase variation include all BUT
Responses
A meiosis.meiosis.
B DNA cloning.DNA cloning.
C crossing over.crossing over.
D translocation.
B DNA cloning
answer all 6 questions
1. The primary goal of meiosis is: D) Daughter cells are produced with only half the chromosomes of the parent cell.
2. The false statement about mutations is: A) Mutations must be present in parents and then passed to offspring. (Mutations can also occur spontaneously or as a result of environmental factors in an individual without being passed on to offspring.)
3. Parents can pass on chromosomes to their children that are different than their own when the new gene combinations are created by: D) Crossing over of homologous chromosomes during meiosis.
4. All of the following circumstances, EXCEPT ___________ can produce new combinations of genetic traits in sperm and eggs that are different from the parents: B) Errors during mitosis.
5. The effect that is NOT associated with crossing over of homologous chromosomes during prophase I of meiosis is: B) Increased number of chromosomes in the offspring.
6. Naturally occurring methods of recombining DNA within a species to increase variation include all BUT: B) DNA cloning.