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Reporting Category 2 Mechanisms of Genetics. Station 9. Genetic Variations. Essential Question – Bell Ringer. Hemophilia is a sex-linked trait that is carried on the X chromosome. Why is there a higher probability that males will exhibit the characteristics of hemophilia than females?.

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Station 9

Reporting Category 2

Mechanisms of Genetics

Station 9

Genetic Variations


Essential question bell ringer

Essential Question – Bell Ringer

Hemophilia is a sex-linked trait that is carried on the X chromosome. Why is there a higher probability that males will exhibit the characteristics of hemophilia than females?


Essential question bell ringer1

Essential Question – Bell Ringer

Hemophilia is a disease, carried only on the X chromosome in humans, that prevents blood from clotting properly. Males have one X and one Y sex chromosome, so the hemophilia gene can appear on only one chromosome in males—but males need only one hemophilia gene to exhibit the characteristics of the disease. Females have two X chromosomes and thus have an increased chance of carrying the gene on one of the chromosomes. However, the gene must be present on both X chromosomes in order for females to exhibit the characteristics of hemophilia. Therefore, males are more likely than females to exhibit the characteristics of hemophilia.


Pre preview question

Pre-Preview Question

Genotypes for fruit fly wings

W = Normal Wings w = wrinkled wings

  • What are the phenotypes?

    Ww -

    ww -

    WW -

Normal Wings

Wrinkled Wings

Normal Wings


Pre review question

Pre-Review Question

  • If Mary and Tom have a child, what is the probability that they will have a boy?

50% Boy

50% Girl

XY

XX

XY

XX


Pre review question1

Pre-Review Question

  • If Mary is a carrier for hemophilia (sex-linked, recessive) and Tom does not have hemophilia, what are the possible genotypes for their offspring?

What is the probability they will have a child with hemophilia?

XHY

XHXH

XhY

XHXh

1/4 chance of having a child with hemophilia


Lab activities

Lab Activities

  • You will now go back to the lab and complete the activities for today’s topic.


Practice

Practice

R – Red eyesW – normal wings B – Normal bristlesY – Yellow body

r – white eyesw – wingless b – no bristlesy - black body

  • The white charts above contain the alleles for several fruit fly traits.

  • Cross the male and female for wings. What is the phenotypic ratio for the F1 generation?


Practice1

Practice

R – Red eyesW – normal wings B – Normal bristlesY – Yellow body

r – white eyesw – wingless b – no bristlesy - black body

  • The white charts above contain the alleles for several fruit fly traits.

  • Cross the male and female for eye color (Remember this is a sex linked trait). What is the phenotypic ratio for the F1 generation?


Practice2

Practice

R – Red eyesW – normal wings B – Normal bristlesY – Yellow body

r – white eyesw – wingless b – no bristlesy - black body

  • The white charts above contain the alleles for several fruit fly traits.

  • Complete a dihybrid cross for bristles and body color . What is the phenotypic ratio for the F1 generation?


I need to be able to

I need to be able to……..

  • Analyze and make inferences about dominant and recessive traits.

  • Interpret and make predictions about genotypes and phenotypes

  • Determine and interpret phenotypic ratios.

  • Understand the difference between Mendelian and non-Mendelian traits.

  • Use Punnett squares and other models to predict the results of genetic crosses involving X-linked traits.

  • Interpret results and make predictions from monohybrid and dihybrid crosses.


Post review question

Post Review Question

Homozygous Dominant

Homozygous Recessive

Heterozygous

Which term above can be represented with the following alleles?

AA

Homozygous Dominant


Post review question1

Post Review Question

Homozygous Dominant

Homozygous Recessive

Heterozygous

Which term above can be represented with the following alleles?

Aa

Heterozygous


Post review question2

Post Review Question

Homozygous Dominant

Homozygous Recessive

Heterozygous

Which term above can be represented with the following alleles?

aa

Homozygous Recessive


Post review question3

Post Review Question

Non-Mendelian Genetics

Incomplete Dominance

RR – Red WW- White

If a red flower and a white flower are crossed, what will the phenotype of the F1 generation be?

RW = Pink


Post review question4

Post Review Question

Non-Mendelian Genetics

Co Dominance

BB – Brown WW- White

If a brown cow and a white cow are crossed, what will the phenotype of the F1 generation be?

BW – brown and white spots


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