SMA (spinal muscular atrophy) is a rare recessive genetic disorder. Using a punnet square calculate the chance of a heterozygous (Both are carriers) couple having a child with the disease.

N= normal central nervous systemn=spinal muscular atrophy

Blue eyes are due to a recessive allele (b). What is the chance of 2 heterozygous brown eyed people having a blue eyed child.

B=Brown eye colorb=blue eye color

  

 

  

  

 

   

 HAPPY WEDNESDAY 

Small GroupCHAMPS

G2Computer

BELLWORK:  Read the following article (at your desk on yellow paper) about SMA and complete both Punnett squares to the right.

 BB BbBb bb

NN Nn

Nn nn

Now what is the chance of the couple having a blue eyed child with the disorder?

N= normal central nervous system B=Brown eye colorn=spinal muscular atrophy b=blue eye color

¼ x ¼ = 1/161 out of 16 chance of having blue eyes with

the disorder.

 BB BbBb bb

NN Nn

Nn nn

Now what is the chance of the couple having a brown-eyed child without the disorder?

N= normal central nervous system B=Brown eye colorn=spinal muscular atrophy b=blue eye color

¾ x ¾ = 9/16 9 out of 16 chance of having blue eyes with

the disorder.

Unit 5 – GeneticsDefinitions Due Thursday (12/3/15)All Parts Due Thursday (12/10/15)

1. Allele2. Co-Dominance3. Dihybrid Cross4. Dominant5. Gene6. Genotype7. Gregor Mendel8. Heterozygous9. Homozygous

10.Hybrid11.Incomplete

Dominance12.Monohybrid13.Multiple Alleles14.Pedigree15.Phenotype16.Polygenic17.Punnett Square

18.Purebred19.Recessive20.Sex-linked Traits

PG 70

Collect TodayPage 82 – Bikini Bottom GeneticsPage 80 – Pedigree Practice CORRECTIONS

AssignedPage 70 – Notecard ALL PARTS (TOMORROW) Most Missed MAKE-UP Quiz (TOMORROW)Page 85 – Incomplete Practice (TOMORROW)Genetics MAKE-UP Quiz (Monday)Page 77 – Family Tree Project Part 2 (Monday)Genetics Exam (Monday)Genetics Vocabulary MAKEUP Quiz (WEDNESDAY)

Late Page 80 – Pedigree Practice (-50%)Page 74 – Family Tree Project Part 1 (-50%)

Essential Question  

What other forms of dominance exist in 

organisms?Standard

B6F - Predict possible outcomes of genetic combinations such as Non-Mendelian Genetics.

PG 83/85Direct 

InstructionCHAMPS

Mendel’s principles form the basis of the modern science of genetics.

The inheritance of biological characteristics is determined by individual units called genes.

Genes are passed from parents to their offspring.

In cases in which two or more forms (alleles) of the gene for a single trait exist, some forms of the gene may be dominant and others may be recessive.

In most sexually reproducing organisms, each adult has two copies of each gene.

These genes are segregated from each other when gametes are formed.

The alleles for different genes usually segregate independently of one another.

There are exceptions to most of Mendel’s principles.

All genes do not show simple patterns of dominant or recessive alleles.

Cases in which one allele is not completely dominant over another are called incomplete dominance.

In this case, the heterozygous phenotype looks like a blending of the two homozygous phenotypes.

Incomplete Dominance Example

Spongebob loves growing flowers for his gal pal, Sandy. She loves the Poofkin flowers—red, purple, and blue! Interestingly enough, the Poofkin flowers display incomplete dominance in their genes for color.

1. Using “R” for red and “B” for blue, what would be the genotypes for the following phenotypes?

red: ______ purple: _____ blue: _____

2. Complete a Punnett square for a red Poofkin and a purple Poofkin.

PG 85

RR BBRB

Male:  Female: RR RB

HW: Incomplete Practice

PG 85

Essential Question  How does the genotype change with a dihybrid 

cross?

Spongebob loves growing flowers for his gal pal, Sandy. She loves the Poofkin flowers—red, purple, and blue! Interestingly enough, the Poofkin flowers display incomplete dominance in their genes for color.

1. Using “R” for red and “B” for blue, what would be the genotypes for the following phenotypes?

red: ______ purple: _____ white: _____

2. What are the genotypic and phenotypic ratios when you cross a purple radish with a white radish?

PG 84

RR WWRW

Male:  Female: RW WW

1.   2.   3.

1. 2. 3. 4.

1. 2. 3.

Non-Mendelian Genetics Practice Problems

Incomplete Dominance/Codominance

Blood Typing Problems

Sex-Linked Problems