Processes that determine heredity and contribute to genetic variation
Meiosis guarantees that in a sexual life cycle, offspring will inherit one complete set of chromosomes (and their associated genes and traits) from each parent. The transmission of traits from parents to offspring is called heredity.
Another important aspect of meiosis and the sexual life cycle is the role these processes play in contributing to genetic variation. Although offspring always resemble their parents, they are genetically different from both of their parents and from one another. The degree of variation may be tremendous.
The following processes are associated with meiosis and the sexual life cycle:
DNA replication before meiosis
crossing over
chromosome alignment in metaphase I and separation in anaphase I
chromosome alignment in metaphase II and separation in anaphase II
fertilization
Sort each process into the appropriate bin according to whether it contributes to heredity only, genetic variation only, or both.
Processes that determine heredity and contribute to genetic variation Meiosis guarantees that in a sexual life...
Concept 13.2: Fertilization and meiosis alternate in sexual life cycles Chromosomes - karyotype - homologous chromosomes (homologs) - sex chromosomes vs. autosomes - haploid vs. diploid Life cycle (gametes/fertilization/zygote/adult) - meiosis Concept 13.3: Meiosis reduces the number of chromosome sets from diploid to haploid Meiosis 1 - Prophase 1 synapsis/crossing over
Question 36 2 pts How does the sexual life cycle increase the genetic variation in a species? by allowing crossing over by conserving chromosomal gene order by increasing gene stability by allowing fertilization
How is genetic variation increased during sexual reproduction? Choose ALL that apply. Select one or more: a. Crossing over occurs. b. The reproduction of cells through binary fission resulting in two different daughter cells. c. Independent assortment of homologous chromosomes during meiosis. d. Alleles are inherited from two parents instead of one. e. The pairing of sister chromatids. Which of the following images shows crossing over? Select one: Consider a gene with two alleles that show complete dominance. When two...
Genetic variability is A) achieved through meiosis B) due to both crossing over and the law of independent assortment. c) why two siblings are uniquely different from each other. D) All of the above are true. 16. Given the image on the right of the onion root tip col, which of the following is NOT TRUE? A) The most common cell cycle stage is anaphase. B) All the stages of mitosis are depicted in the image. c) There is one...
Question 1 (1 point) Saved Which of these processes must precede fertilization? a) oxidation O b) respiration Oc) mitosis Od) meiosis O e) mutation Question 2 (1 point) Which of the following diseases is not hereditary? O a) sickle-cell anemia O b ) cystic fibrosis c) diabetes d) arthritis O e) none of the above Question 3 (1 point) was an early pioneer in the field of genetics with his famous experiments with pea plants. a) Mendel Ob) Linnaeus OC)...
)CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they Il at night I and B) fis COz inho organic acids during the C) fix COg into pyruvate is the D) ix Coz into sugars i E) use the enayme ien the bundle-sheath cels whicdh outcompetes rubisco for CO 13) in yeast signal transduction, the yeast A) peoduce signal molecules that interact with one another 1 e signal molecules that change themselves...
Can anyone help me with this? Thank you. Lab 13. Mitosis and Meiosis Purpose The purpose of this lab is to understand the process of mitosis and melosis in animal and plant cells. Learning Objectives After completing this lab, you will be able to: 1. Describe the stages of mitosis. 2. Identify the stages of mitosis in an onion root or whitefish blastula using a light microscope. 3. Describe how cytokinesis differs in plant vs. animal cells. 4. Name and...
please help and thank you Materials Needed per class: 1 box of 24 microscope slides of meiosis 1 1 box of 24 microscope slides of meiosis 2 red and yellow popbead chromosome kits Objectives To become familiar with the process of meiosis and to be able to identify the principal phases of meiosis To understand how the process of meiosis is similar to mitosis and how it differs from mitosis Introduction The genetic information of a cell is encoded in...
(cach question: 1 point) 1) If you see a red leaf, what color(s) of light in the visible light spectrum is/are being reflected? A) red B) all colors except red C) all colors D) no colors Answer: 2) permit CO2 to enter the leaf and O2 to escape. A) Mesophyll cells B) Thylakoids C) Stomata D) Chloroplasts Answer: 3) Chlorophyll is found in which part of the plant cell? A) stroma B) cytoplasm C) thylakoid D) plasma membrane Answer: 4)...
9-6 M. A. Merritt, 2016 1511 Lab Exercise #9 PROCEDURE 2: Simulation of the stages of Meiosis 1) To simulate synapsis, take the two homologous pairs of lona chromosomos and place one on top of the other. Do the same with the #2, medium length chromosomes and then the # 3 , short chromosomes., Fill in the sketch for PROPHASE 1 below, illustrating synapsis. Even though crossing over occurs in nature, DO NOT add CROSSING OVER to your sketch. After...