University:
Eastern Kentucky University
Course:
BIO 100 | Introductory Biology
Academic year:

2021
Views:

49

Pages:

1
Author:

Bailey Hester

School to Home LESSON 1 Sexual Reproduction and Meiosis Review Directions: Use your textbook to answer each question. 1. The production of an offspring resulting from the combination of genetic materials of two different cells is called sexual reproduction. How is a zygote formed in sexual reproduction? A zygote forms when an egg and a sperm join. 2. Diploid cells have two sets of chromosomes, whereas haploid cells have only one set of chromosomes. Are sex cells haploid cells or diploid cells? Sex cells are haploid, they only have one chromosome from each pair of chromosomes. 3. Meiosis and mitosis are similar processes in which an organism produces new cells. What are the differences between the processes of meiosis and mitosis? a. Mitosis divides the parent cell _1__ time(s) to make __2___ body cells. Meiosis divides the parent cell _2__ time(s) to make __4____ sex cells (gametes). b. Body cells made by mitosis have __2__ set(s) of chromosomes. Sex cells (gametes) made by meiosis have _1_ set(s) of chromosomes. 4. Meiosis produces cells that are not genetically identical to the parent cell. What are the advantages and disadvantages of sexual reproduction? a. Two advantages of sexual reproduction are genetically varied (different) offspring and the ability to use selective breeding. Genetic variation is an advantage because Genetic variation gives individuals within a population slight differences that might be an advantage if the environment changes. Selective breeding is an advantage because Selective breeding has been used to develop desirable traits in plants and animals. Three disadvantages of sexual reproduction are the need to find a mate, the time it takes organisms to mature to the age they can reproduce, and the time it takes an organism to have a pregnancy. Finding a mate is a disadvantage because too much time and energy is needed. Having to mature to reproductive age is a disadvantage because _______________________________. Pregnancy is a disadvantage because ____________________________________________________.