Please Take Out The Following:PencilScience Journal: Notes PortionChapter 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 VocabularyBased 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) Sex-Linked (X-Linked) Dominant

B) Autosomal Recessive

C) Sex-Linked (X-Linked) Recessive

D) 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 VocabularyWhat is it called where an allele of a gene

separates from each other during meiosis?

AnswerWhat is it called where an allele of a gene separates from each other during meiosis?

Mendel’s Law of Segregation

Core & Honors VocabularyWhen two alleles for a gene cause a blended

phenotype, this is called: ___________________

AnswerWhen two alleles for a gene cause a blended

phenotype, this is called: Incomplete Dominance

VocabularyWhen one allele/genes affects multiple traits on the

phenotype, it is called: ____________________

AnswerWhen 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 VocabularyWhen multiple pairs of genes determine a trait, it is

called: __________________________________

AnswerWhen multiple pairs of genes determine a trait, it is

called: Polygenic Inheritance

Core & Honors VocabularyWhen two different alleles for a trait are both

expressed, it is called: ________________

AnswerWhen two different alleles for a trait are both

expressed, it is called: codominance