WarmUP (Page 144) Meiosis 1 is the separation of while ...mwrightsclassroom.weebly.com/uploads/2/1/7/9/... · Meiosis 1 is the separation of _____ while Meiosis 2 is the ... •Meiosis

WarmUP (Page 144)

Meiosis 1 is the separation of ________ while Meiosis 2 is the separation of ___________.

Draw/Define Homologous Chromosomes:

Draw/Define Sister Chromatids:

• Review Quiz from Yesterday

• Concept Map (Meiosis 2– Quiz tomorrow!)

• Keynotes (Pictures and Phases Labeled)

• Meiosis 1 and 2 RECAP (use Concept Map)

• 13 Questions (use Concept Map)

• Show me before you leave… they are due today!

• Concentration Cards

• Study Guide

1. Where does an organism inherit the two chromosome sets that create the diploid cell? What type of cells? from parents; haploid sex cells

2. If human somatic cells have 46 chromosomes, how many chromosomes do human gametes have? 23

3. How many chromosomes do fertilized eggs contain? Are fertilized eggs haploid cells or diploid cells? 46; diploid

4. The Triffle has a diploid number of four. What will the haploid chromosomes number be? 2

5: How many chromatids are present in the nucleus after DNA replication? How many pairs of chromosomes? 8 chromatids; 4 chromosomes

6: What is crossing over? Why is it essential for creating unique gametes? Exchange of genetics material; creates diversity

7: Why do the homologous chromosomes line up side by side instead of in a row? HINT: What is the purpose of Meiosis? What would happen to the chromosome number if they were in single a line?

To reduce the number of chromosomes to create haploid cells; if in line make diploid

8: How many chromatids are present in the nucleus after DNA replication? How many pairs of chromosomes? 8 chromatids; 4 chromosomes

9: Are these two cells haploid or diploid? Are the chromosomes duplicated or not?

Haploid; duplicated

10: How is Prophase 2 and Metaphase 2 different from Prophase 1 and Metaphase 1? No crossing over occurs in Prophase 2 and Homologous chromosomes line up side by side Metaphase 2; Metaphase 1 sister chromatids (X fromation) line up in a ros

11: How is Anaphase 2 and Anaphase 1 different? Homologous chromosomes split in A1; sister chromatids in A2

12: How is Telophase 2 different from Telophase 1? How do the gametes/cells compare to cells created in Mitosis?

13: How does Meiosis I differ from Meiosis II?

Students will be able to predict inherited traits by using the principles of Mendelian genetics (including segregation, independent assortment, and dominance). SC Biology Standard 4.6

• Warm-UP: 150

• In your family, do you resemble anyone? Why

might you think so?

• Announcements (Redo)

• Mendelian Notes

• Classroom Phenotype Activity

• Standard 4.6 Predict inherited traits

by using the principles of Mendelian

genetics

• 4.7 Summarize the chromosome

theory of inheritance and relate that

theory to Gregor Mendel’s principles

of genetics.

• Essential Question:

•Why are there greater varieties of

traits among organisms that

sexually reproduce?

• Austrian Monk

• Bred thousands of pea plants (approximately 28,000)

to show patterns of inheritance

• BEFORE Gregor Mendel, society believed that parents’

traits were blended in offspring

• Kind of like mixing red and white paint together to get pink paint

• OR like mixing brown and blue eyes to produce children with

muddled brown eyes

• AFTER Gregor Mendel, scientists accepted the fact that traits are

inherited as discrete (individual) units from the parental

generation

• Kind of like a bag of different colored marbles. Each marble can

still be picked out separately.

• REMEMBER:

1. Genetics is the study of genes and patterns of inheritance.

2. Genes control each trait of a living thing by controlling

the formation of an organism’s proteins.

• Traits are distinguishing characteristics that are

inherited:

• Examples:

• Eye color

• Hair color

• Leaf shape

• Tail length

• Somatic cells are diploid

• They have 2 of each type of chromosome

• Because of this, each cell contains two genes for

each trait

• one on the maternal chromosome and one on the

paternal chromosome

• These two genes may be the same or different

form.

• The different forms of a gene are called alleles

• Each allele produces a different characteristic of each

trait.

• For example, a gene for plant height might occur in

a tall form and a short form.

• For example, a gene for ear lobes might occur in

an attached and unattached form.

• Sometimes called the principle of

dominance

• The law of dominance states that

some alleles are dominant

whereas others are recessive.

• An organism with a dominant

allele for a particular trait will

always have that trait expressed

(seen) in the organism.

• An organism with a recessive

allele for a particular trait will only

have that trait expressed IF the

dominant allele is not present.

•Organisms receive one gene for a

chromosome from each parent

•Alleles are represented by letters:

•The capital letter represents the dominant

allele

•The lower-case letter represents the

recessive allele

• Organisms with two identical alleles for a

particular trait are homozygous for that trait

•TT represents a homozygous dominant

genotype

• tt represents a homozygous recessive

genotype

• Organisms with two different alleles for a

particular trait are heterozygous for that

trait.

•Tt represents a heterozygous genotype

• The genotype (genetic makeup) of an

organism shows the type of alleles that an

organism has for a particular trait.

•TT represents a homozygous dominant genotype.

• tt represents a homozygous recessive genotype.

•Tt represents a heterozygous genotype.

• The phenotype of an organism is the way that a

trait is expressed in the organism (physical

appearance)

•Organisms with genotypes of TT or Tt would have a

phenotype of tall (dominant trait).

•Organisms with a genotype of tt would have a

phenotype of short (recessive trait).

• Genotype and Phenotype of a homozygous cow where black fur is dominant over white: _______________

• Genotype and Phenotype of a heterozygous orange cat: _____________

• Genotype and Phenotype of a homozygous recessive white bunny: ____________

• Genotype and Phenotype of a heterozygous purple flower: ____________

• Genotype and Phenotype of a homozygous dominant purple flower: ____________

• Genotype and Phenotype of a homozygous recessive white cat, where black fur is dominant: ____________________

BB; Black

Oo; Orange

bb; white

Pp; purple

PP; purple

bb; white

1. Investigating Human Traits Activity-

page 158

2. Homework Study Guide- page

147 (1-14; 16-20;23)

Trait Form 1 # Form 2 #

Ear Lobes Free 10 Attached 6

Hairline Straight 9 Widow’s Peak 7

Tongue Roller 14 Non-Roller 2

Hand clasping R. over L. 6 L. over R. 10

Arm Folding

Finger mid-joint hair

Right on Top

Present

9

2

Left on Top

Absent

7

14

Thumb Hitchhiker’s 8 Straight 8

Hair Color Brown 13 Blonde/Red 3

Curly Hair/Straight Curly 6 Straight 10

Eye Color Blue/Grey 8 Brown/Hazel 8

Left/Right Hand Left 3 Right 13

Chin cleft Present 0 No cleft 16

Dimples/No Dimples Dimples 7 None 9

Freckles/No Freckles Freckles 11 No Freckles 5






Arm Folding


Right on Top

Present

10

1

Left on Top

Absent

8

17


Hair Color Brown 16 Blonde/Red 2












Arm Folding


Right on Top

Present

13

2

Left on Top

Absent

10

21


Hair Color 20 Blonde/Red 3







1. Bugs

2. Redo Sheet

3. Homework Study Guide- page 147 (1-14; 16-20;23)

4. Show me your vocab

5. Color coding sheet

Documents

WarmUP (Page 144) Meiosis 1 is the separation of while ...mwrightsclassroom.weebly.com/uploads/2/1/7/9/... · Meiosis 1 is the separation of _____ while Meiosis 2 is the ... •Meiosis