Exam 3

Exam 3 What do you think is the most likely cause for the cycles you see in these data? Seasonal differences in CO2 uptake by photosynthesizers. The predicted consequences of continued warming include: All of the above Rising sea levels Extreme weather patterns Spread of tropical diseases CO2 has increased ___ since 1850. 40% Identify the continent that would be exposed to the most UVB radiation due to ozone depletion. Antarctica Ozone Protects the earth from UV radiation Which of the following statements about the greenhouse effect is true? The greenhouse effect is made worse by the burning of fossil fuels. Name an animal that lives in a tropical pitcher plant? Crab spider What are the two different strategies of plants growing in a new clearing in a jungle? Slow/steady and fast growing climbers Where do rainforests mainly occur? In equatorial regions Prior to mitosis, each chromosome of a eukaryotic cell consists of a pair of identical structures called Sister chromatids When animal cells are grown in a petri dish, they typically stop dividing once they formed a single, unbroken layer on the bottom of the dish. This arrest of division in an example of Density-dependent inhibition Which of the following occurs during interphase? Cell growth and duplication of the chromosomes Looking into your microscope, you spot an unusual cell. Instead of the typical rounded cell shape, the cell has a very narrow middle separating two bulging ends. It appears to resemble the number 8. Then you realize that this cell is Undergoing cytokinesis At the start of anaphase of mitosis, Sister chromatids separate Which of the following statements regarding sexual and asexual reproduction is true? Only offspring from asexual reproduction inherit traits from one parent What is the main purpose of meiosis in a sexual life cycle? To reduce chromosomes number from diploid to haploid. Which of the following statements regarding the differences between mitosis and meiosis is false? Meiosis provided for asexual reproduction Two chromosomes in a nucleus that carry loci for the same gene in the same positions on the chromosome but specify different versions of some traits constitute a pair of Homologous chromosomes Which of the following statements if false? Gametes are made by mitosis During which stage of meiosis does crossing-over occur? Prophase I Nondisjunction occurs when Members of a chromosome pair fail to separate During which phase of mitosis do the chromosomes line up on a plane equal distance from the two poles? Metaphase You are asked to grow an unidentified sample of animal tissue. You notice that the cells seem not to exhibit density-dependent inhibition. Which of the following choices would be the most likely source for this tissue sample? A cancerous tumor Which of the following does not enhance genetic diversity? Mitosis of somatic cells All the offspring of a cross between a black-eyed beetle and an orange-eyed beetle have orange eyes. This means that the allele for black eyes is ____ the allele for orange eyes. Recessive to A monohybrid cross is A breeding experiment in which the parents differ in only one character. What is the expected genotypic ratio of the F2 generation of a monohybrid cross. 1:2:1 if A is dominant to a and b and B is dominant to b, what is the expected phenotypic ratio of the cross AaBb x AaBb? 9:3:3:1 All the offspring of a cross between a red-flowered plant and a white-flowered plant have pink flowers. This means that the allele for red flowers is ____ to the allele for white flowers. Incomplete dominant The expression of both alleles for a trait in a heterozygous individual illustrates Codominance Luke Skywalker’s parents have normal hearing. However, Luke Skywalker has an inherited form of deafness. Deafness is a recessive trait is associated with the abnormal allele ‘d’. The normal allele at the locus, associated with normal hearing, is “D”. Luke Skywalker’s parents could have which of the following genotypes? Dd and Dd Alleles of a single gene are found at ____ chromosomes? The same locus on homologous Which of the following terms refers to the situation where a single phenotypic characteristic is determined by the additive effects of two or more genes? Pleiotropy A color-blind woman marries a man. Han Solo, who is not color blind. All of their sons, but none of their daughters, are color-blind. Which of the following statements correctly explains these results? And may the force be with you? The gene for color vision is linked to the X chromosomes Which one of the following is false? DNA uses the nitrogenous base uracil Who is credited for determining that the sugar/phosphate backbones are parallel? Franklin How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine? The DNA molecule would Have irregular widths along its length DNA replication Uses each strand of a DNA molecule as a template for the creation of a new strand. Which of the following statements regarding the structure of DNA is false? The sugar of DNA is ribose Based on the picture of the Elodea cells to the right, which of the following solutions are added to the microscope slide? Salt solution Identify the proper mitotic phase in the image to the right. Metaphase C-fern gametophytes are Haploid KNOW phases of meiosis #43-47 matching KNOW : 48. Nitrogenous base 49. Phosphate group 50. Deoxyribose