Mendelian genetics
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Mendelian Genetics. Genetics- study of how parents pass traits on to their offspring. Genes code for a trait. A version of a gene is called an allele You have two copies of each gene, one from each parent. Autosomal Homologous Chromosome #8. From MOM. From DAD. Brown Eyes. Blue Eyes.

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Mendelian Genetics

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Mendelian genetics

Mendelian Genetics

Genetics- study of how parents pass traits on to their offspring


Mendelian genetics

  • Genes code for a trait.

  • A version of a gene is called an allele

  • You have two copies of each gene, one from each parent.

    Autosomal Homologous

    Chromosome #8

From MOM

From DAD

Brown Eyes

Blue Eyes

Tall

Short


Mendelian genetics

The srygene controls testicular development and is only found in males. Which chromosome is it most likely found on?

A) On any autosomal chromosome (1-22)

B) On Chromosome #8

C) On the X Sex Chromosome

D) On the Y Sex Chromosome


Mendelian genetics

The srygene controls testicular development and is only found in males. Which chromosome is it most likely found on?

A) On any autosomal chromosome (1-22)

B) On Chromosome #8

C) On the X Sex Chromosome

D) On the Y Sex Chromosome


Two words to know

Two words to know:

  • Genotype: The genes or combination of alleles shown by two letters. (Tt, TT, tt, Rr, RR, rr, CC, Cc, cc)

  • Phenotype: How an organism looks like (Tall, short, Round, Squared, Colorblind, Not Colorblind)

    • Phenotype: Physical Features!!!

    • Genotype: Genes!!


Mendelian genetics

  • If a boy inherits an allele for brown eyes and another for blue eyes, what will his eye color be?

  • Some alleles are dominant, meaning they block the expression of the other allele. Dominant alleles are CAPITALIZED! The allele that is not dominant is called recessive (lower case letter)

MOM

DAD

Dominant

Recessive

Brown Eyes (B)

Blue Eyes (b)


Mendelian genetics

2 more words to know

Homozygous: genotype with two same alleles for a trait

(Example: TT, tt)

Heterozygous: genotype with two different alleles for a trait (Example: Tt)


Mendelian genetics

Gene: Eye Color

B = Brown eyes

b= blue eyes

BB = Homozygous Dominant (Genotype)

Phenotype? Brown Eye Color

Bb = Heterozygous Dominant (Genotype)

Phenotype? Brown Eye Color

bb = Homozygous Recessive (Genotype)

Phenotype? Blue Eye Color


Write question and answer pg 140

Write Question and Answer: Pg 140

  • Are the following genotypes Homozygous or Heterozygous

    TT __Homozygous___

    Tt _______________

    Aa _______________

    DD_______________


Mendelian genetics

2. Is it a genotype or a phenotype?

Aa _________________

Eye Color ____________

Nose Shape __________

RR _____________


Mendelian genetics

3. Is the genotype homozygous dominant, homozygous recessive, or heterozygous?

AA _____________________

Aa _____________________

Ee _____________________

ee _____________________


Mendelian genetics

  • A rabbit that has the trait for black fur is dominant over white fur. If B= Black fur and b = white fur, what is the phenotype of the following genotypes:

    BB ____Black fur____

    Bb________________

    bb _______________


The famous punnett square

The Famous Punnett Square

  • Used to predict the traits of an offspring.

    EX: What is the probability or what is the chance that my child will have brown eyes?

  • You need mom and dad’s genotypes to figure this out.


Mendelian genetics

Momis homozygous dominant for brown eyes. Dadis heterozygous for that gene. Find the possible genotypes and phenotypes of the offspring. (Brown eyes is dominant over blue eyes)

B B

Possible Genotype:

2/4 BB or 50% BB

2/4 Bb or 50% Bb

Possible Phenotypes:

100% Brown Eyes

B

b


Mendelian genetics

Homer is homozygous recessive for the spiky hair allele. Marge is heterozygous for the spiky hair allele. S is spiky hair, s is non-spiky hair. Find the possible genotypes and phenotypes of the offspring.

ss

Possible Genotype:

2/4 Ss or 50% Ss

2/4 ss or 50% ss

Possible Phenotypes:

50% Spiky Hair

50% Non-spiky hair

S

s


Mendelian genetics

What is a Carrier?


Mendelian genetics

Hemophiliais a bleeding disorder. It is a sex-linked recessive trait. Hemophiliacs tend to bleed inside their body, especially in the knees, ankles, and elbows. This bleeding can damage organs and tissues and may be life threatening. A wife is a carrier, the male has hemophilia.

What is the probability that a baby girl will have hemophilia?

___/____ or _______%

What is the probability that a baby boy will have hemophilia?

___/____ or _______%

What is the probability that the next child will NOT have hemophilia?

___/____ or _______%


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