3 1 Sex Linked
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Transcript of 3 1 Sex Linked
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LaunchWhat does it mean to be homozygous
recessive? *Use scientific language and terms*
Complete the punnett using ratios for genotype and phenotypes:
Why in a normal human being do you only get one allele from each parent?
X Y
XX
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Cross a homozygous dominant with a recessive (for height where T is dominant and tall).
Find the genotype and the phenotype
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Cross a heterozygote with a recessive (for height where T is dominant and tall).
Find the genotype and the phenotype
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Cross a heterozygote with another heterozygote (for skin color where Black is B, b = white).
Find the genotype and the phenotype
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Cross a heterozygote with another heterozygote (for nose size where big nose is N and small nose is n).
Find the genotype and the phenotype
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a trait that is found on either the X or Y chromosome
Examples include baldness and color blindness
Sex Linked Trait
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Sex linked traits are more likely to affect males
Sex Linked Trait
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Hemophilia is a disease where your blood doesn’t clot.
Hemophilia is an example of a sex linked trait.
Hemophilia
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Hemophilia only occurs when all of the X chromosomes have a copy of the recessive gene.
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XHXh:female carrier XhXh:female
hemophiliac XHY:normal male XhY:hemophiliac
male
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chart that shows the relationships within a family
PEDIGREE
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Pedigree BasicsMales are squares, females are circles
Shaded figures represent individuals with the trait
Generations are numbered with roman numerals (I, II, II, IV) from top to bottom
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Klinefelter SyndromeMales with Klinefelter syndrome have two X
chromosomes, and one Y
X Y XX
0
XXX XXY
X,0 Y,0
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Klinefelter SyndromeHave male genitalia and internal ducts, but
underdeveloped testesDo not produce spermSlight enlargement of the breasts47,XXY1 out of every 500 male births
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Turner SyndromePeople with Turner Syndrome only receive
one sex chromosome, an X.
X Y XX
0
XXX XXY
X,0 Y,0
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Turner SyndromeHas female external genitaliaUnderdeveloped ovariesShort (under 5 feet)Webbed NeckBroad, Shield-like chest45,X1 out of every 3000 female births