Biology, 25.07.2019 01:30, 4tazaouiamine1r

Which process occurs when chromosomes do not separate during meiosis? evolution nondisjunction transformation replication

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Biology, 30.06.2019 22:30, kayleebueno

Answers amoeba sisters: video recap meiosis1. interphase must occur before meiosis can happen. what would happen is interphase didn't occur first? 2. a cell that begins meiosis has 23 chromosomes inherited from the mother and 23 chromosomes inherited from the father. in the process of meiosis, chromosomes begin to match up in homologous pairs. how would you know if two chromosomes were homologous? 3. crossing-over is a very important event in prophase i of meiosis! what happens during crossing over and what is the significance? 4. meiosis does pmat twice! that means there is a prophase i and ii. there is a metaphase i and ii, etc. if the cartoon below has chromosomes in the middle of the cell, how should you know whether it was in metaphase i or ii? 5. meiosis does not always occur without any difficulties. describe what occurs during nondisjunction and the effect on the resulting cells.

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History, 22.09.2019 03:30, dozsyerra

Which of the following statements is true of nondisjunction? a. nondisjunction means “not coming apart.” b. nondisjunction is caused by chromosome pairs that fail to separate correctly. c. nondisjunction occurs when pieces of chromosomes break off and get lost. d. both a and b are true of nondisjunction.

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Biology, 12.10.2019 16:00, SchoolSucks234

Answer for brainliest 2. myosin is plentiful in muscle cells, but is not found at all in lens cells. lens cells contain large amounts of crystallins, which are not found in muscle cells. why do some proteins appear in one type of cell but not in another? during differentiation, certain genes are added to cells to produce proteins that enable specific functions. differentiated cells release unused proteins into the blood for other cells to use. differentiated cells produce all proteins but destroy the proteins they do not use. during differentiation, certain genes are activated to produce proteins that enable specific functions. 3. which of the following statements best explains the role of meiosis in reproduction? meiosis allows chromosomes to exchange genetic material through crossing over. meiosis makes it possible for a zygote to have the correct number of chromosomes. meiosis increases the chances of fertilization because it produces four daughter cells. meiosis results in offspring with genotypes that are not exact copies of the parents. 4. which statement is true of both mitosis and meiosis? both occur only in reproductive cells. dna replication occurs before the division of the nucleus. both are involved in asexual reproduction. the number of chromosomes is reduced by half. 5. the diagram below represents structures found in a human female. which process results in the formation of structure x? meiosis cloning recombination mitosis 6. meiosis is a type of cell division in which germ cells divide to produce haploid cells. where does meiosis occur? muscle cells bone cells ovary cells brain cells 7. the diagram below shows a process that affects chromosomes during meiosis. this process can be used to explain the origin of new combinations of traits in offspring why some offspring physically resemble their parents why some offspring are genetically identical to their parents the process of differentiation in offspring 8. why is approximately 50% of any individual’s dna inherited from that individual’s father? half of the individual’s cells descend from the father’s gamete. it was passed to the individual by a gamete from the father. half of the individual’s nuclei descend from the nucleus of the father’s gamete. it was passed to the individual by a somatic cell from the father. 9. nondisjunction during meiosis results in an abnormal number of chromosomes in one or more gametes. in some cases of nondisjunction, a single chromosome fails to separate. in others, none of the chromosomes separate. suppose an egg is produced in which none of the chromosomes separate during meiosis ii. what is the chromosome number of the zygote that results if this egg is fertilized by a normal sperm? 2n + 1 1n 3n 2n 11. which phrase best describes a process represented in the diagram below? a zygote dividing by mitosis a zygote dividing by meiosis a gamete dividing by mitosis a gamete dividing by meiosis

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World Languages, 14.10.2019 21:30, KenzieSparkles

There are three forms of nondisjunction: failure of a pair of homologous chromosomes to separate in meiosis i, failure of sister chromatids to separate during meiosis ii, and failure of sister chromatids to separate during mitosis. nondisjunction results in daughter cells with abnormal chromosome numbers (aneuploidy).

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