1. Can you think of anything that would prevent meiosis from occurring in an organism with one set of chromosomes? 2. Cell-free fetal DNA analysis can be used to determine whether a fetus has trisomy 21 (Down syndrome). Speculate about how this diagnosis could be achieved, even though this cell-free test does not visualize the chromosomes directly as in a karyotype

1. Can you think of anything that would prevent meiosis from occurring in an organism with one set of chromosomes? 2. Cell-free fetal DNA analysis can be used to determine whether a fetus has trisomy 21 (Down syndrome). Speculate about how this diagnosis could be achieved, even though this cell-free test does not visualize the chromosomes directly as in a karyotype

Name: 1. Can you think of anything that would prevent meiosis from occurring
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Description: 1. Can you think of anything that would prevent meiosis from occurring in an organism with one set of chromosomes?2. Cell-free fetal DNA analysis can be used to determine whether a fetus has trisomy 21 (Down syndrome). Speculate about how this diagno

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter13: Observing Patterns In Inherited Traits

Section: Chapter Questions

Problem 7SQ: A testcross is a way to determine ________. a. phenotype b. genotype c. dominance

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A testcross is a way to determine ________. a. phenotype b. genotype c. dominance
6. There are two enzymes LDH1 and LDH2. The gene that encodes this enzyme is X-linked. You extract the enzyme from different cells in several people and carry out electrophoresis. Give the genotypes for each person Draw the banding pattern that you would expect in the gel. Male with Male with Female Female Heterozygous LDH1 gene homozygous female LDH2 homozygous for LDH2 for LDH1
2) A. Explain how polyribosomes form. B. Why might you expect the insertion of 3 DNA base pairs to be less disruptive than th deletion of a single base pair? C. Compare and contrast mitosis and meiosis with respect to their genetic outcomes? D. What are the possible consequences of non-disjunction during cell division? E. How does meiosis increase genetic diversity in populations?
6. Consider your btoehr and your son. a. If you are female, will your brother and your son have essentially identically Y chromosomes? Explain your answer. b. If you are male, will your brother and your son have essentially identical Y chromosomes? Explan your answer.
1. Assume that you are married and by chance upon submission for an amniocentesis prenatal checkup it resulted that your baby has more than the total number of chromosomes. What will your final decision to this finding? Answer must not exceed 30 words 2. “All organisms have a constant chromosome number. The chromosomes’ sizes vary. If by chance the two sentences are not found in the organisms, what will happen? Answer must not exceed 30 words
6. An X-linked ichthyosis is a recessive form of a family of skin diseases caused by a hereditary deficiency of the steroid sulfatase (STS) enzyme. A woman heterozygous for this mutation mates with the phenotypically normal man and produces an XXY son who suffers from the disorder. Which of the answer choices can explain this result? Briefly justify your answer. A) nondisjunction in meiosis I in the father B) nondisjunction in meiosis I in the mother C) nondisjunction in meiosis II in the father D) nondisjunction in meiosis II in the mother
11. Shown below are the offspring of the testcross qr/q +r+ X q r/q r. Which groups are in the recombinant class? q+r and qr+ q+r+ and qr+ qr and qr+ q+r+ and qr
1. Define crossing over and explain when it occurs. 2. Compare any differences in the appearance of genes on chromosomes in gamete cells when crossing over occurs and when it does not occur. 3. Crossing over has been compared to "shuffling the deck" in cards. Explain what this means. 4. What would be accomplished if crossing over occurred between sister chromatids? Explain your answer.
IV. Observation: No Crossing Over Crossing Over Appearance of Gamete Cells Appearance of Gamete Cells V. Analysis: 1. If the two sister chromatids are the same, how are they called? 2. Which specific parts exchanged genetic information during cross over? 3. What is crossing over? 4. When will crossing over occurs? Why? 5. What will happen after crossing over? 6. How do meiosis contributes to genetic variation, while mitosis does not? 7. Why is crossing over important for evolution of species?
1. Given: Adult diploid cell (2n = 8) 2. Illustrate the condition of the chromosomes during the following events in Meiosis: a. prophase I b. anaphase I c. telophase I d. prophase II e. metaphase II f. anaphase II g. daughter cells at end of telophase II/cytokinesis
1a. When a cell of a genotype AaBbCc having all the genes on separate chromosome pairs divides mitotically, what are the genotypes of the daughter cells? 1b. Consider 3 pairs of homologous chromosomes with centromeres labelled A/a, B/b and C/c where the slash separates one chromosome from its homologue. How many different kinds of meiotic products can this individual produce?
1. The figure below represents a karyotype performed on a somatic cell of an unknown organism. Answer the following questions using the figure. a. Circle (and label) 3 different sets of homologous chromosomes? b. This individual is heterozygote for gene A (Aa), Homozygote recessive for gene B (bb) and gene homozygote dominant for gene c (CC). Also, gene B and gene C are linked. Using the homologous chromosomes you circled in part a), provide a representation of the location of the A, B and C, genes and alleles on the homologous chromosomes and sister chromatids in such a way that is consistent with the scenario described above in part b). Choose the chromosomes of your liking to show an appropriate representation. TMIID IL MI