Guided Notes: Chapter 14 Human Heredity
Chromosomes are only visible during cell ______________________ (mitosis/meiosis).
To analyze chromosomes, biologist photograph cells during mitosis and align the chromosomes in homologous pairs.
This picture is known as a ______________________________ .
Types of Chromosomes
On a human karyotype:
Chromosome pairs 1-22 are known as ___________________________.
They code for traits that are not related to sex.
Both males and females have the same type.
Chromosome pair 23 contains the ______________ chromosomes.
Males have ________ and females have ___________.
Did you know??? Sex is determined by the ________________________ of a child.
You have a __________% chance of having a boy or a girl
Mom can give ______
Dad can give ______ or ________
Human GENETIC DISORDERS
Homologous chromosomes ________________ during MEIOSIS = _________________________
____________ syndrome (____________________________ 21)
One cell gets ____ copies of the chromosome the other cell gets _______________________.
Most ___________________chromosomal abnormality
Mild to severe mental retardation
Risk of having a child with Down syndrome increases with _________ of mom
Sex Linked GENETIC DISORDERS
SEX CHROMOSOMES CAN CARRY OTHER GENES TOO = ___________________
Genes _________________________ chromosome
___________________________ GENES: are carried on the Y chromosome
__________________________ GENES: are carried on the Y chromosome
CAUSE: Mutation in genes for __________________ carried ______ chromosome
Blood clotting proteins are missing so person with this disorder can’t stop bleeding when injured;
can ________________ from minor cuts or suffer internal bleeding from bruises or bumps.
deletion in gene that codes for a_______________ on X Chromosome
Results in ________________________ and loss of _______________________
Seen in 1 in every 3000 males in the US
Mutation in one of three genes for _______________ carried on X chromosome
Persons with this disorder have trouble distinguishing colors.
Seen in 1 in 10 males
1 in 100 females
When Harry Met Sally…
Harry and Sally are two normal vision adults who have a color blind son.
B – normal vision b – color blind
What are the genotypes of Harry and Sally?
XB Y, XB Xb
Show the cross between Harry and Sally and draw the Punnett Square:
Give all of the possible genotypes and phenotypes of their offspring.
_________ – normal vision daughter
________ – normal vision daughter (carrier)
________ – normal vision son
________– color blind son
Sally’s dad has normal vision. Is Sally’s Mom colorblind?
Show the ________________________within a family to study one particular ___________________ _______________/phenotype.
Refer to page 342 in text.
Vertical line and bracket=children
Shaded=person expresses trait
Unshaded=person does not express trait.
DRAW Chart for Color Blindness: