Which gender male or female is most likely to have sexlinked traits How many X chromosomes do males have How many X chromosomes do females have Why does a single X chromosome that carries the allele for redgreen colorblindness cause males to be color blind but ID: 930510
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Slide1
p
g. 31
Sex-linked traits are inherited on the ____ chromosome.
Which gender (male or female) is most likely to have sex-linked traits?
How many X chromosomes do males have?
How many X chromosomes do females have?
Why does a single X chromosome that carries the allele for red-green colorblindness cause males to be color blind but
doesn
’
t cause females to be colorblind?
What is a carrier for a sex-linked trait?
Slide2p
g.
37
Show the cross of a man who has hemophilia with a woman who is a carrier. What is the probability that their children will have the disease?
Slide3p
g.
37
#7 A woman
w
ho is a carrier marries a normal man. Show the cross. What is the probability that their children will have hemophilia? What sex will the child in the family with hemophilia be?
Slide4p
g.
37
#8 A woman
w
ho has hemophilia marries a normal man. How many of their children will
have hemophilia
and what is their sex?
Slide5Practice:
Two parents with normal vision have a son who is colorblind. What must be the genotypes of the parents. Show the cross.
Slide6Practice:
A colorblind man marries a woman who has normal vision but they have daughter who is colorblind. What must be the genotypes of the parents? Show this cross.
Slide7Practice:
A woman who is normal for baldness marries a man who is bald. Show this cross. What are the chances that their son will also become bald?
Slide8Practice:
Muscular dystrophy is sex-linked. A man who is normal marries a woman who is affected and they want to have 4 sons. What is the chance of their future sons having the disease?
Slide9Practice:
A man who is bald marries a woman who is also affected and they have a daughter and a son. What is the chance of their children having baldness?
Slide10Practice:
Dihybrid
pg. 34
#5. In guinea pigs, black hair (B) is dominant over white (b) and short hair (L) is dominant over long (l) hair. Cross a pure black and hybrid short haired guinea pig with a true white and homozygous short haired guinea pig. Give the genotypes and phenotypes of the offspring.
Slide11Practice:
Dihybrid
pg. 31
#3.
In guinea pigs, black fur (B) is dominant over white fur (b) and rough fur (R) is dominant over smooth fur (r). Cross a heterozygous parent (
BbRr
) with a heterozygous parent (
BbRr
).