If non-disjunction occurs at meiosis 2 in a male, 2 of the 4 sperm formed in that meiosis will have abnormal numbers of chromosomes. a) True b) False
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Genetics 8 Q3
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- Question 3 Anna (who produces eggs) and Syed (who produces sperm), have a child with Down's syndrome that results from trisomy of chromosome 21. Using a microsatellite sequence on chromosome 21, you run a gel. The gel imaged is attached; darker bands indicate signals of twice the intensity. If a nondisjunction event occurred in Anna during meiosis I, which lane (A, B, C, D) best fits the genotype of their child? Explain your choice, clearly identifying why that lane is correct and why the other lanes are incorrect. Assume no recombination.QUESTION 5 Assume that the diploid number of a certain species is four chromosomes, two large and two small (2n=4). a) Of the following figures, which represents a 3n (triploid) cell in mitotic metaphase? XX XX XX A B D b) For each of the wrong answers from part (a) above, explain briefly why it cannot represent a triploid cell in mitotic metaphase. X x x XQUESTION 8 Match the stages of mitotic cell division to the descriptions of those stages. ]chromosomes attach to spindle fibers across the middle of the cell chromosomes are not yet duplicated so chromosomes only look like a line, Jonly one pair of centrioles in cell A. Cytokinesis cell membrane is pinching in forming a peanut-shaped cell, daughter chromosomes reach the poles and new nuclear membranes are forming around them B. Anaphase C. Telophase D. Early Interphase the nuclear membrane is breaking down, chromosomes are condensing, centrioles are building microtubule "highways" (spindle fibers) E. Prophase chromosomes are duplicated so chromosomes look like an "X", two pairs of centrioles and double the amount of organelles fill the cell F. Late Interphase cell is dividing into two identical cells G. Metaphase daughter chromosomes are beginning their migration to the poles on spindle fibers
- QUESTION 10 Click directly on the chromosomal location named 2q22. You can click on either chromatid, but make sure you are clicking directly on the precise location. 3. 3 4 1 3 4 IMII ক - DQuestion 10 Bb produces type(s) of gametes. O 2 O 1 O 3 O 4Question 4 Meiosis: 1. Keeps the chromosome number constant generation to generation 2. Ensures that all daughter cells have the diploid number of chromosomes 3. Occurs when cells are cloned
- Question 4 Review fertilization of life cycle. The somatic cells of human bodies are O diploid (2N) O haploid (N)QUESTION 9 For the following questions, please fill in the blank with the correct number of chromosomes (e.g. 4). Please do not spell out the number (e.g. four) or include any kind of punctuation (e.g. 4.). In an organism where the diploid number of chromosomes is 2N=8, how many chromosomes would you expect to find in cells that are in G2 of the cell cycle? How many DNA molecules would you expect to find in cells that are in G2 of the cell cycle? How many chromosomes would you expect to find in cells that are in metaphase II? How many DNA molecules would you expect to find in cells that are in metaphase II? How many chromosomes would you expect to find in cells that are in anaphase of mitosis? How many DNA molecules would you expect to find in cells that are in anaphase of mitosis?Question 17 The mother is blood type A, the child is blood type O. The biological father can not be O A OB O AB
- Question 6 Albinism is caused by an autosomal recessive allele that interferes with skin pigmentation in mammals. Two normally pigmented human parents already have an albino boy. They plan to continue to have children until they get a girl. Some or all of this information is important for each of the questions below. a) What is the probability that their next child (currently unborn) will be a girl with albinism? Explain your reasoning. b) What is the probability their first female child will be albino? Explain your reasoning. c) The answer to part (b) is different (and, yes, the answer is different) from the answer to part (a). Explain why. (Hint: it has something to do with the underlined words.)QUESTION 8 A researcher is trying to determine the relationship between the A gene and 3 other genes (B, C and D). She performs three test crosses to determine if the genes are unlinked, incompletely linked or completely linked. Next to each cross is the ratio for the progeny of the cross. In the 3rd column please indicate whether the gene pair being tested is unlinked, incompletely linked or completely linked. Ratio (Alleles indicate phenotype of progeny) Type of Linkage (incompletely linked, completely linked or unlinked) Crosses AaBb x aabb 1 AB: 1 Ab: 1 aB: 1 ab AaCc x aacc 6 AC: 6 ac: 1 Ac: 1 aC AaDd x aacc 1 AD: 1 adQuestion 50 Chromosomes in gametes (known as sperm or egg) are in a haploid state. O True O False