What are the distinguishing features of the sexual and asexual phases for Chlamydomonas? What is the term for the type of syngamy (cell fusion) that occurs between gametes of this Genus? Why?
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- Figure 24.14 Which of the following statements is true? A dikaryotic ascus that forms in the ascocarp undergoes karyogamy, meiosis, and mitosis to form eight ascospores. A diploid ascus that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A haploid zygote that forms in the ascocarp undergoes karyogamy, meiosiis, and mitosis to form eight ascospores. A dikaryotic ascus that forms in the ascocarp undergoes plasmogamy, meiosis, and mitosis to form eight ascospores.What is the name of thecells capable of makinggametes? What is the ploidyof these gamete-formingcells?Figure 9.3 Schematic representation of sexual reproduction (hyphal fusion) in Sordaria fimicola. ㅏ (a) Tan X Tan (b) -Haploid- Black X Black (c) Tan X Black (with no crassing-over) Fusion -Diploid- Majosis I 想想 * X* X * Y * X * Meiasis I X X X X X X -Haploid- Mitosis Position in ascus Bad D II CHIXO Nonrecombinant type
- 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 haploidis mature spirogyra haploid or diploid? what type of sexual life cycle is being exhibited by this organism?IDENTIFY: This refers to the haploid phase in the Polysiphonia life cycle.
- What are the respective ploidies of gamete, zygote and somatic cells in a species with gametic meiosis?In the moss Polytrichum commune, the haploidchromosome number is 7. A haploid male gametefuses with a haploid female gamete to form a diploid cell that divides and develops into the multicellular sporophyte. Cells of the sporophyte thenundergo meiosis to produce haploid cells calledspores. What is the probability that an individualspore will contain a set of chromosomes all ofwhich came from the male gamete?If meiosis of a diploid organism produces haploid cells, then how is a diploid offspring generated? a) Crossing over between two haploid gametes b) DNA replication in haploid gametes c) fertilization involving two haploid gametes d) Independent assortment of haploid gametes
- Which are the three tetrad types produced by meiosis of dihybrid yeast?"Two identical gametes will unite and undergo fertilization to form a diploid zygote. Right after becoming a zygote, it will immediately undergo meiosis to produce haploid spores. The multicellular adult form is also a haploid that will produce the gametes." - This process is also known as a Select the correct response(s): Haplodiplontic life cycle Haplontic life cycle Oogamy IsogamyWhy do gametes have to be haploid instead of diploid?