What is a karyotype? a. The collection of all the mutations present within the genome of an individual b. A system of classifying cell nuclei c. The set of unique physical characteristics that define an individual d. A display of every pair of homologous chromosomes within a cell, organized according to size and shape e. The combination of chromosomes found in a gamete
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A display of every pair of homologous chromosomes within a cell, organized according to size and shape. This is a technique used in genetics to visualize chromosomes under a microscope, and it can be used to detect certain genetic disorders. Show more…
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Which of the following statements describes the chromosomal makeup of each daughter cell after telophase of meiosis I? Select one: a. The cells are diploid, and the chromosomes are each composed of a single chromatid. b. The cells are haploid, and the chromosomes are each composed of a single chromatid. c. The cells are diploid, and the chromosomes are each composed of two chromatids. d. The cells are haploid, and the chromosomes are each composed of two chromatids.
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1. A) Which of the following best describes metaphase? a.) chromosomes attach to the spindle fibers b.) chromosomes uncoil c.) chromosomes meet in the middle of the cell d.) chromosomes separate e.) chromosomes coil up f.) chromosomes duplicate g.) crossing over occurs 2. B) What happens in prophase I but not in prophase II? a.) the nuclear envelope reappears b.) DNA Polymerase c.) spindle formation occurs d.) crossing over occurs e.) homologous chromatids coil f.) the number of chromosomes doubles g.) sister chromosomes uncoil h.) chromosomes move to the middle of the cell 3. C) A chromosome that has gone through S phase but not mitosis consists of what? a.) two homologous chromatids b.) two homologous chromatids joined by a centromere c.) two sister chromosomes joined by a centromere d.) two homologous chromosomes joined by a centromere e.) two sister chromatids f.) two homologous chromosomes g.) two sister chromatids joined by a centromere 4. D) What is the best explanation for a DdEe Ă— ddee cross producing offspring in a 6:6:2:1 phenotypic ratio? a.) linkage b.) codominance c.) natural selection d.) pleiotropy e.) epigenetics f.) complete dominance g.) incomplete dominance
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b. Here is a close-up of one chromosome 13. How many double-stranded DNA molecules does it contain? c. What is the total number of chromosomes in the karyotype? d. Is this individual haploid or diploid? e. Which two macromolecules occur in these chromosomes? f. Is this individual a male or female? How do you know? g. If 20% of the nucleotides in this genome are T’s, how many are A’s? h. …and how many are G’s? 36. Draw a 2n= 6 cell in metaphase I of meiosis with the genotype AABbGg, assuming that none of the genes are linked and that there is no crossing over. Label the alleles on the chromosomes. 37. Write the genotypes of the cells you expect at the end of meiosis based on
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