Final Exam Instructions: Please choose the best short answersbelow. 2 pts each)
ID: 85096 • Letter: F
Question
Final Exam Instructions: Please choose the best short answersbelow. 2 pts each) 1. During Meiosis L, chromosomes undergo a forming a A) cross over, dyad B) synapsis: tetrad C fertilization: zygote D) switch over; tetrad E) none of the above 2. When one sperm nucleus fuses with the ovum and another sperm nucleus fuses with two polar bodies this process is called A) Triple fertilization B) Quadruple fertilization C) Fusion D) Double fertilization E) None of the above 3. When mating flies, virgin females are distinguished by their A) Pointed bottoms, sex combs B) Colorless under belly, dark spot C) Round bottom, sex combs D) Colored body, darks spots E) None of the above 4. The term is always applied to a chromosome with an intact centromere. A) Inversion B) Translocation C) Pericentric D) Paracentric E) DerivativeExplanation / Answer
1) B) synapsis; tetrad. During prophase I, homologous chromosomes pair and exchange DNA and results in chromosomal crossover. The paired and replicated chromosomes are called tetrads. The process of pairing the homologous chromosomes is called synapsis.
2) D) Double fertilization. One sperm fertilizes the egg cell and the other sperm combines with the two polar nuclei of the large central cell of the megagametophyte. The haploid sperm and haploid egg combine to form a diploid zygote, while the other sperm and the two haploid polar nuclei of the large central cell of the megagametophyte form a triploid nucleus.
3) A) Pointed bottom, sex combs. Pointed bottoms and sexcombs (a row of dark bristles on the tarsus of the first leg).
4) E) Derivative. A derivative chromosome is generated either by rearrangement involving two or more chromosomes or by multiple aberrations within a single chromosome. The term always refers to chromosome that has an intact centromere.
26) A) the pattern of information flow in the cell. The central dogma of molecular biology describes the flow of genetic information in cells from DNA to messenger RNA (mRNA) to protein.
27) C) Both. The feature of ascomycota group is ascus, a microscopic sexual structure in which nonmotile spores are formed. However, some species of the Ascomycota are asexual and thus do not form asci or ascospores.
28) C) chromatid 2 and 3. During crossover, these chromatids are closer, so they have high percentage of synapsis.
29) A) interphase. In s-phase of interphase , DNA replication happens.
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