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Transcript
Please Take Out The Following:
Pencil
Science Journal: Notes Portion
Chapter 8 Homework Packet
*If you have not taken the
Chapter 8 Quiz from yesterday,
SEE ME NOW!
Explain this pedigree
In sex-linked traits only females can be carriers.
What disease do you think is displayed from this
pedigree?
Core & Honors Vocabulary
What is an autosomal trait?
Answer
Autosomal: Pertaining to a chromosome that
is not a sex chromosome.
People normally have 22 pairs of autosomes
(44 autosomes) in each cell together with
two sex chromosomes (X and Y in the male
and XX in the female).
Core & Honors Vocabulary
Based on the pedigree below, is the disease sex
linked (X-Linked), or autosomal? Why?
Answer
Core & Honors Vocabulary
What best describes Huntington’s Disease?
A)
B)
C)
D)
Sex-Linked (X-Linked) Dominant
Autosomal Recessive
Sex-Linked (X-Linked) Recessive
Autosomal Dominant
Answer
HUNTINGTON’S DISEASE – A genetic
disorder that is caused by an autosomal
dominant allele. Every one who inherits the
allele develops Huntington’s disease and has a
50% chance of passing it on to
offspring. Symptoms do not develop until a
person is over 30 (late onset). Death is caused by
the gradual breakdown of cells in the brain.
Core & Honors Vocabulary
When alleles for different characteristics are on
separate chromosomes, they are distributed to
gametes separately. This is known as:
________________________________________
Answer
When alleles for different characteristics are on
separate chromosomes, they are distributed to
gametes separately. This is known as:
The Law of Independent Assortment
*Mendel's Law of Independent Assortment - The alleles
of the many different genes present in any given
(diploid) organism segregate/assort from one another
in a random fashion (see dihybrid cross)
Vocabulary
Which sets of gametes can come from an
individual with the genotype: AaNn
Answer
AaNn
Core & Honors Vocabulary
What is it called where an allele of a gene
separates from each other during meiosis?
Answer
What is it called where an allele of a gene separates from each other during meiosis?
Mendel’s Law of Segregation
Core & Honors Vocabulary
When two alleles for a gene cause a blended
phenotype, this is called: ___________________
Answer
When two alleles for a gene cause a blended
phenotype, this is called: Incomplete Dominance
Vocabulary
When one allele/genes affects multiple traits on the
phenotype, it is called: ____________________
Answer
When one allele/genes affects multiple traits
on the phenotype, it is called: Pleiotropy
Pleiotropy – the ability of one gene to affect an organism in many ways.
Core & Honors Vocabulary
When multiple pairs of genes determine a trait, it is
called: __________________________________
Answer
When multiple pairs of genes determine a trait, it is
called: Polygenic Inheritance
Core & Honors Vocabulary
When two different alleles for a trait are both
expressed, it is called: ________________
Answer
When two different alleles for a trait are both
expressed, it is called: codominance