M-Genetics C6 Questions and Answers 100% Verified

The condition that exists when an organism gains or loses one or more chromosomes but not a complete haploid set is known as ________. aneuploidy Which of the following is viewed as a major cause of aneuploidy? nondisjunction If a species has a haploid number of 10, how many chromosomes would an individual of this species have if it were 2n + 3? 23 Which of the following statements about nondisjunction is FALSE? It only occurs during meiosis I. Which of the following statements about nondisjunction is TRUE? - It may fail to separate maternal chromatids from one another or paternal chromatids from one another. - It may fail to separate maternal from paternal chromosomes. - It occurs more frequently in human females over age 35. - It can occur during meiosis I or meiosis II If a species has a haploid number of 10, what term would we use to describe an individual with 11 chromosomes? trisomic Which of the following would be considered a triploid? Klinefelter's syndrome Patau's syndrome both Down's and Patau's syndrome Down's syndrome none of these none of these 3 multiple choice options Which of the following is a method for harvesting fetal cells for karyotyping? amniocentesis chorionic villus sampling noninvasive prenatal genetic diagnosis fetal ultrasound amniocentesis, chorionic villus sampling, and noninvasive prenatal genetic diagnosis amniocentesis, chorionic villus sampling, and noninvasive prenatal genetic diagnosis 3 multiple choice options The incidence of Down syndrome, also known as trisomy 21, increases with increasing maternal age. Which of the following errors most likely produces this condition? - Nondisjunction during meiosis II in either the male and female gamete - Nondisjunction during either meiosis I or II in the male gamete - Nondisjunction during meiosis I in either the male and female gamete - Nondisjunction during either meiosis I or II in the female gamete Nondisjunction during either meiosis I or II in the female gamete 3 multiple choice options Females with only one X chromosome do not develop; this condition is lethal. false Which of the following statements about the products produced when nondisjunction occurs during meiosis I is true? Two products of the second meiotic division have both the maternal and paternal chromosomes of a set and the other two products have none for that set. 3 multiple choice options What explanation has been proposed to explain why Down syndrome is more often the result of nondisjunction during oogenesis rather than during spermatogenesis? The incidence of Down syndrome due to increasing maternal age is higher than the incidence due to increasing paternal age. 3 multiple choice options Female gametogenesis starts ___A___ and is finished only ___B___ . Because progression of meiosis is ___C___ , it has been suggested that the ___D___ period of ___E___ and recombination may be involved in the nondisjunction of chromosomes in females and, as a result, a trisomy in their children