Work out the Punnett square & JUSTIFY YOUR ANSWER!!! Bell Work: 2/28/13 Work out the Punnett square & JUSTIFY YOUR ANSWER!!!

63. Asexual vs. Sexual Reproduction Objectives Classify methods of reproduction as sexual or asexual. (SPI 0707.4.1) 63. Asexual vs. Sexual Reproduction

Determining the Sex or Gender of Offspring Sex chromosomes carry genes that determine the sex or gender of offspring. In humans, females have two X chromosomes and males have one X and one Y chromosome. During meiosis, one of each of the chromosome pairs ends up in a sex cell. Baby boy= XY Baby girl= XX Set up a Punnett square to figure out the probability of the gender of the offspring.

Sex Chromosome Probability

Sex Chromosome: Chromosome 23 (XX or XY)

Living Things Reproduce 2 Types of Reproduction: Asexual- a single parent produces an offspring identical to the parent Sexual- two parents produce an offspring with traits of both parents

Challenge Questions When animals go through sexual reproduction, what type of cell division are they going through? meiosis When animals go through asexual reproduction, what type of cell division are they going through? mitosis

Types of Asexual Reproduction In Animals Budding: happens when a part of the parent organism pinches off and forms a new organism. The new organism separates from the parent and lives independently. Jellyfish & hydra

Types of Asexual Reproduction In Animals Fragmentation: parts of the organism break off and a new organism grows identical to the parent. Worms & starfish

Types of Asexual Reproduction In Animals Regeneration: organism loses a body part and that part may develop into a new organism. Sea star

Asexual Reproduction in Other Organisms Binary fission is a method of asexual reproduction in which an organism splits into two. This occurs in bacteria and other single-celled organisms

Asexual Reproduction in Plants Some plants can reproduce asexually when they are cut or damaged. These plants can sprout new growth from their roots, stems, and leaves. In wild strawberry plants, stems are capable of arching downward and taking root in the ground, resulting in the formation of a new plant. This is an example of asexual reproduction.

Be ready to justify your answer!

Scenario Stations Number a loose-leaf sheet of notebook paper (in the numbered folder at your group) 1-16, skipping two lines in between each number. At each station there are two scenarios (real-world examples) of either sexual or asexual reproduction. You and your group will have 2 minutes at each station to do the following: Classify each method of reproduction in the scenario as sexual or asexual reproduction. Justify your answer. The scenarios at Station #8 (lab table 8) will be for extra credit, but it is mandatory that you try them! We will discuss these either at the end of class or first thing tomorrow. When you are finished, you will complete an exit ticket comparing and contrasting sexual vs. asexual reproduction.

Exit Ticket: Compare & Contrast Sexual vs Exit Ticket: Compare & Contrast Sexual vs. Asexual Reproduction using a Venn diagram. Sexual Reproduction Asexual Reproduction