Alternation of Generations Spore formation Sporangia Haploid form Place the letter in the appropriate blank A. Archegonia B. Gametophyte C. Fertilization D. Structures for spore production E. Antheridia F. Meiosis G. Sporophyte H. Mitosis Eggs Diploid form Gamete formation Sperm Gamete fusion
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- In fungi, asexual spores are produced by_________ celldivision and have__________ set(s) of chromosomes.Sexual spores are produced by________ cell divisionin a(n)_______ and have_________ set(s) ofchromosomes.When pools containing Chlamydomonas begin to dry,A. diploid cells fuse to become zygotesB. haploid cells encystC. haploid cells undergo syngamyD. haploid cells undergo meiosis In Ulva, gametes and zoospores differA. in the number of flagellaB. in whether or not they must fuse to continue growthC. in the number of chromosomes of the parentD. all of the aboveSporophytesA. are diploidB. are produced by sporesC. produce next generation sporophytesD. produce gametes by meiosis Ulva sporophyte reproductive cellsA. become four zoosporesB. produce zoospores by meiosis and mitosisC. become 8 or 16 biflagellate gametesD. none of the above
- When gametes from snail combine to make a zygote, how many chromosomes are most likely inthe zygote.In Ulva, gametes and zoospores differA. in the number of flagellaB. in whether or not they must fuse to continue growthC. in the number of chromosomes of the parentD. all of the abovePhases of meiosis Metaphase I a) Tetrads line up on cell’s equator.
- Which of the following structures is diploid? a. Microsporeb. Eggc. Megaspored. MicrosporocyteBPA and Abnormal Meiosis In 1998, researchers at Case Western University were studying meiosis in mouse oocytes (germ cells) when they saw an unexpected and dramatic increase of abnormal events (FIGURE 12.6). Improper segregation of chromosomes during meiosis is one of the main causes or human genetic disorders. The spike in abnormal meiosis began right after the mouse facility started washing the animals' plastic cages and water bottles in a new, alkaline detergent. The detergent had damaged the plastic, which as a result was leaching bisphenol A (BPA). BPA is a synthetic chemical that mimics estrogen, the main female sex hormone in animals. Though it has since been banned for use in baby bottles, BPA is still widely used to manufacture other plastic items and epoxies (such as the coating on the inside of metal cans of food). BPA-free plastics are often manufactured with a related compound, bisphenol S (BPS), that has effects similar to BPA. FIGURE 12.6 Abnormalities in meiosis that occurred after exposure to BPA. Top, the most abnormal meiosis events occurred in mice that were housed in damaged plastic caging with damaged plastic bottles. Damaged plastic releases BPA. Bottom, fluorescent micrographs show the chromosomes (red) and spindle (green) in nuclei of mouse germ cells in metaphase I. A Normal metaphase; BD abnormal metaphase. What percentage of mouse oocytes displayed abnormalities of meiosis with no exposure to damaged caging?The embryos of diploid plants are ____________. Group of answer choices diploid Haploid, diploid or tetraploid could all be correct because the ploidy number varies depending on the embryo’s developmental stage. tetraploid None of answers shown are correct because embryos lack genetic material. haploid
- In embryophytes, especially spermatophya, what is the difference between a "sporocyte" (e.g., megasporocyte) and the actual spore (e.g., megaspore)? a) Meiosis: Megasporocyte is still diploid, megaspore haploid b) Mitosis, number of nuclei: Megaspore has eight cell nuclei, megasporocyte only one c) Cytokinesis: Megasporocyte has only one cell, Megaspore can have several (as endosporic gametophyte). d) None: the two terms are synonymous. e) Meiosis: Megaspore is still diploid, megasporocyte haploidIn an alternation of generations life cycle, spores developinto____________ that produce gametes that fuse to giverise to__________ .a. haploid gametophytes; diploid sporophytesb. diploid gametophytes; haploid sporophytesc. haploid sporophytes; diploid gametophytesd. diploid sporophytes; haploid gametophytesIn Alternation of Generations Life Cycles, There Are Both Diploid and Haploid Multicellular Stages