Bio 30 Unit 3 Lesson 1 Assignment

.docx

School

Mount Royal University *

*We aren’t endorsed by this school

Course

Subject

Biology

Date

Jan 9, 2024

Type

docx

Pages

Uploaded by MagistratePanther411

Biology 30 Unit 3 Lesson 1 Assignment Total /61 1. Down’s syndrome is a human genetic condition caused by ________trisomy_______________ of the __21_____ pair of chromosomes. /2 2. Explain the process of crossing over in detail. During meiosis, specifically in prophase I, homologous chromosomes actively exchange sections of DNA through a process known as crossing over. This results in the creation of genetic diversity: an event occurring at points termed chiasmata that introduces new combinations of genetic material onto chromosomes. Shuffling alleles between chromosomes through crossing over enhances offspring variability: this process ultimately contributes to genetic diversity and population adaptation. /3 Use this information to answer the question. 3. The presence of only one X-chromosome in each body cell of a human female produces a condition known as Turner's syndrome. This condition most probably

results from process Z which is _nondisjunction____________________________. Symptoms of Turner’s syndrome include: The absence or partial loss of an X chromosome in females, due to nondisjunction, causes Turner syndrome. Short stature, delayed puberty, and physical features such as a webbed neck are common symptoms. In addition, one may also experience infertility; heart and kidney issues; as well as learning difficulties. /3 Use the following information to answer the next question The following statements are related to the events which occur in the various stages of a cell cycle. 1. Chromosomal alignment occurs in the equatorial plate. 2. Chromosomes become longer and thicker. 3. Chromatids separate and move to opposite poles. 4. Chromosomes shorten and thicken. 5. Chromosomes duplicate. . 4. Place the matching number in the blank. ____4___prophase ____1___metaphase ____2__ telophase ____3__ anaphase ____5_ interphase /5 5. Which of the following represents anaphase? A. B. C. D.

/1 Use the diagram to answer the nest question. 6. The row below that identifies process 1 and process 2 is /1 Row c Use the diagram to answer the question.

7. DNA replication will occur during stages A. 1 only B. 1 and 2 C. 2 and 3 D. 3 and 4 /1 8. A haploid number of chromosomes can be defined as The haploid number of chromosomes signifies the distinctive count within a cell when it exists in its haploid phase, constituting precisely half of the total chromosomes present in diploid cells, which carry two complete sets. In humans, this corresponds to 23 separate and unique chromosomes. Through the process of meiosis, a specific type of cell division involved in gamete formation, human cells, initially diploid, halve their chromosome count to produce gametes containing this haploid set of 23 chromosomes. /2 Use this diagram to answer this question. 2 4 5 1 3 interphase cell nucleus centriole chromatin chromosome spindle fiber chromatoid Four of the 48 chromosomes in a monkey cell are shown. 240051 threads

9. The process shown will produce A. one functional ovum B. four diploid sperm cells C. four haploid sperm cells D. one sperm and three polar bodies /1 10. Which of the following statements about the production of gametes is correct? A. Equal cleavage occurs during oogenesis B. Polar bodies are formed during oogenesis C. Unequal cleavage occurs during spermatogenesis D. One functional sperm is formed during spermatogenesis /1 11. Meiosis involves A. one chromosome duplication and one cytoplasmic cleavage B. two chromosome duplications and no cytoplasmic cleavage C. one chromosome duplication and two cytoplasmic cleavages D. two chromosome duplications and two cytoplasmic cleavages /1 12. The function of meiosis is to 240038

Meiosis generates haploid gametes from diploid cells, ensuring the right chromosome count for reproduction. /2 13. A human sperm contains A . 23 chromosomes B. 23 pairs of chromosomes C. one set of homologous chromosomes D. two sets of homologous chromosomes /1 Use the diagram to answer this question. 14. Which phase of meiosis is represented in the diagram? A. Prophase I B. Anaphase II C. Metaphase I D. Metaphase II /1 One Phase of Meiosis 240025

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version