Bell Work: 2/28/13

Work out the Punnett square & JUSTIFY YOUR ANSWER!!!

Objectives

• Classify methods of reproduction as Classify methods of reproduction as sexual or asexual. (SPI 0707.4.1)sexual or asexual. (SPI 0707.4.1)

63. Asexual vs. Sexual Reproduction 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:Sex Chromosome:Chromosome 23 (XX or XY)Chromosome 23 (XX or XY)

xx

Living Things Reproduce

2 Types of Reproduction:2 Types of Reproduction:

AsexualAsexual- a single parent produces an - a single parent produces an offspring identical to the parentoffspring identical to the parent

SexualSexual- two parents produce an - two parents produce an offspring with traits of both parentsoffspring with traits of both parents

Challenge QuestionsChallenge Questions1.1. When animals go through sexual When animals go through sexual

reproduction, what type of cell division reproduction, what type of cell division are they going through?are they going through?

– meiosismeiosis

2.2. When animals go through asexual When animals go through asexual reproduction, what type of cell division reproduction, what type of cell division are they going through?are they going through?

– mitosismitosis

Types of Asexual Reproduction In Animals

• BuddingBudding: happens : happens when a part of the when a part of the parent organism parent organism pinches off and forms pinches off and forms a new organism.a new organism.

• The new organism The new organism separates from the separates from the parent and lives parent and lives independently.independently.– Jellyfish & hydraJellyfish & hydra

Types of Asexual Reproduction In Animals

• FragmentationFragmentation: : parts of the parts of the organism break organism break off and a new off and a new organism grows organism grows identical to the identical to the parent. parent.

– Worms & Worms & starfishstarfish

Types of Asexual Reproduction In Animals

• RegenerationRegeneration: : organism loses a organism loses a body part and body part and that part may that part may develop into a develop into a new organism.new organism.

– Sea starSea star

Asexual Reproduction in Other Organisms

• Binary fission Binary fission is a is a method of asexual method of asexual reproduction in reproduction in which an organism which an organism splits into two. splits into two.

• This occurs in This occurs in bacteriabacteria and other and other single-celled single-celled organismsorganisms

Asexual Reproduction in PlantsAsexual Reproduction in Plants

• Some plants can reproduce asexually Some plants can reproduce asexually when they are cut or damaged. These when they are cut or damaged. These plants can sprout new growth from plants can sprout new growth from their their roots, stems, and leavesroots, stems, and leaves. .

• In wild strawberry plants, stems are In wild strawberry plants, stems are capable of arching downward and capable of arching downward and taking root in the ground, resulting in taking root in the ground, resulting in the formation of a new plant. This is an the formation of a new plant. This is an example of example of asexual reproductionasexual 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:

1. Classify each method of reproduction in the scenario as sexual or asexual reproduction.

2. 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:Exit Ticket:Compare & Contrast Sexual vs. Asexual Compare & Contrast Sexual vs. Asexual

Reproduction using a Venn diagram.Reproduction using a Venn diagram.

Sexual Reproduction

Asexual Reproduction