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Punnett-Square-activity.pdf, Exercises of Genetics

University of the Pacific (UOP)Genetics

Colour blindness is a gene defect on the X‐chromosome. To get colour blindness a male has the defect gene on X only.

Typology: Exercises

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10.0Probabilityinreallife.notebook

1

May19,2017

Genetics

GeneticistuseaPunnettSquaretodeterminethe

probabilityofapersoninheritingaparticulargene.

APunnettSquarecanbeusedasapredictivetoolforcouples

wantingtostartafamily.

parent

genes

Parent

genes

child

childchild

Mother

Father

x

y

x

xx

x

y

x

y

maleshave'x'and'y'

femaleshave'x'and'x'

chromosomes

Male

x

y

Female

x

notcolourblind

yx

colourblind

x

femalecarrier

xx

ColourblindnessisagenedefectontheX‐chromosome. To

getcolourblindnessamalehasthedefectgeneonXonly.

Forafemaletogetcolourblindnessthegenemustbeon

bothX‐chromosomes.

IftheFemalehasonedefectthensheisacarrier.

colourblind

notcolourblind

x

Defecton

X‐chromosome

Partial preview of the text

Download Punnett-Square-activity.pdf and more Exercises Genetics in PDF only on Docsity!

Genetics Geneticist use a Punnett Square to determine the probability of a person inheriting a particular gene. A Punnett Square can be used as a predictive tool for couples wanting to start a family. parent genes Parent genes child child child child Mother Father

x

y

x x

x x xx

xy^ xy

males have 'x' and 'y' females^ have^ 'x'^ and^ 'x' chromosomes chromosomes Male

x y

Female

x x

not colour blind

x^ y

colour blind

x x

female carrier

x x

Colour blindness is a gene defect on the X‐chromosome. To get colour blindness a male has the defect gene on X only. For a female to get colour blindness the gene must be on both X‐chromosomes. If the Female has one defect then she is a carrier. colour blind not colour blind

x

Defect on X‐chromosome

Determine the probability that a couple will have a child with colour blindness if a) the father is not colour blind and the mother is a carrier b) the father is not colour blind and the mother is colour blind c) the father is colour blind and the mother is a carrier d) the father is colour blind and the mother is not a carrier Create the Punnett Square to show the possibilities of each child Determine the Probability of children, boys and girls being colour blind. a) the father is not colour blind and the mother is a carrier father not colour blind (^) mother is a carrier

x x

x

y

x x x x

x y x^ y

Probability of children colour blind = 1/4 or 25% Probability of boys colour blind = 1/2 or 50% Punnett Square is a table (looks like tic‐tac‐toe)