Download Genetics WEBQUEST: Turn sound off. Turn subtitles on Link 1: http

Genetics WEBQUEST: Turn sound off. Turn subtitles on
Link 1: http://www.bbc.co.uk/schools/gcsebitesize/science/21c/genetics/inheritanceact.shtml
INHERITANCE
Inherited characteristics are controlled by __________. Genes may have different
forms called ________________ .
Eye color has two alleles. ____________ and __________________
What color will your eyes be if you have a brown and and blue allele? ___________
Using Genetic diagrams: Capital letters mean the allele is _____________ & lower
case letters mean the allele is _________________
Which combination from the genetic diagram gives blue eyes? _________
This is how _______________________________ can be expressed in the children.
HUNTINGTON’S DISEASE affects the nervous system.
Huntington’s disease is caused by a ________________ allele. This means you only
need________ allele to get the disease. Fill in the diagram below. What percentage
of the offspring will have Huntington’s disease? ___________
Parent 1
Parent 2
Link 2: From the sidebar list, click genes come in pairs
http://www.dnaftb.org/2/concept/index.html
Mendel focused on 7 individual traits in pea plants.
1. Pure bred plant strains contained only ________form of the gene.
Click animation now.
2. What are some phenotypes of Mendel’s peas? Give 3 examples:
a. __________________________________________________
b. __________________________________________________
c. __________________________________________________
3. Give the genotype of the green seed and yellow seed.
Green: ___________
Yellow: _____________
4. A pure-bred pea always has ______ copies of the same allele.
Link 3: Punnett Squares and the probability of Inheritance.
http://anthro.palomar.edu/mendel/quizzes/mendqui2.htm
CYSTIC FIBROSIS affects cell membranes causing certain cells to produce too
much mucus. This affects ______________ and ___________________.
Cystic Fibrosis is a recessive disease. You need to have ____ alleles to get
the disease. Two small “f’s” means you (have/do not have) the disease.
T or F Carriers do not show the trait for cystic fibrosis.
There is a ______% chance that children will inherit both dominant alleles
and not be a sufferer or be a carrier.
T or F Embryos can be screened for Genetic diseases.
Sex chromosomes: Differences in men and women
Humans have ______ pairs of chromosomes. Sex chromosomes determine
whether you are X or Y. Women have ___ ___. Men have ___ ___
Sperm and egg cells are _____________. All eggs have ___ chromosomes
Sperm can have ____ or _____ chromosomes.
When egg and sperm pair up, which combination produces a male child? __
A female child? _____
Answer the 6 problems given and check to see if you are correct. Use the
Vocabulary Reminders below to help you solve the problems.
Homozygous dominant: TT
Homozygous recessive: tt
Heterozygous (hybrid): Tt
Carriers: A hybrid person with a recessive trait for a disease but they do not
show the disease themselves.
1. ________
2. ________
3. – 6. Use the Punnett squares below to answer these questions.
3.
4.
5.
6.