Download Student Review for Human Genetics, Patterns of

Student Review for Human Genetics, Patterns of Heredity, and Pedigrees Exam
Exam will be on Wednesday, March 11th for Even classes and Thursday March 12th for Odd Classes.
Things you should focus on while studying…
1. Practice using punnett squares and solving genetics problems (I have some for extra practice)
2. Be able to identify incomplete dominance and codominance when given examples.
3. Predict the possible or probable genotypic and phenotypic outcomes of offspring when crossing parent organisms
that are heterozygous and homozygous dominant or recessive. (again, I have sample problems)
4. Identify genotypes as homozygous dominant, recessive or heterozygous.
5. Determine the parents of babies when given blood types of the parents and babies in question.
6. Understand and explain Mendel’s Laws of Inheritance
7. Explain what makes males male and females female.
8. Know our diploid and haploid number.
9. Know what gametes are, what process makes them, how many chromosomes (diploid or haploid) they have in
them.
10. Be able to predict the probability of having a boy or a girl using a punnett square.
11. Be able to explain the inheritance of sex-linked disorders and the probability of passing them on using punnett
squares.
12. Explain why males cannot be carriers of an X-linked trait and why they will either have it or not.
13. Be able to identify pattern of inheritance using a pedigree.
14. Be able to read a pedigree to determine relationships between individuals
15. Be able to determine if an individual is affected or a carrier using a pedigree.
16. Be able to predict the genotype of individuals in a pedigree.
17. Identify the following genotypes as homozygous (HO) or heterozygous (HE) and if it is dominant (d) or recessive
(r)
HH _____
Ii _____ ee _____
Tt _____ pp _____
18. In goats, a recessive gene causes the goats to "faint" when they are startled. A farmer breeds two goats (that have
never fainted) and their first offspring faints two days after its birth. What must the parent's genotypes have been?
Show the cross to prove it.
19. In humans, tongue rolling is a dominant trait, those with the recessive condition cannot roll their tongues. Bob can
roll his tongue, but his mother could not. He is married to Sally, who cannot roll her tongue. What is the probability
that their first born child will not be able to roll his tongue?
20. Red-Green Color blindness is an X-linked recessive disorder. What chance does a man who is colorblind have of
passing it on to his son?
21. An unaffected man and a woman who is a carrier for colorblindness are married and planning on starting a family.
What are the chances they will have a child who is colorblind?
22. A nurse at a hospital removed the wrist tags of three babies in the maternity ward. She needs to figure out which
baby belongs to which parents, so she checks their blood types. Using the chart below, match the baby to its
correct parents. Show the crosses to prove your choices.
Parents
Blood Types
Baby
Blood type
Mr. Hartzel
O
Mrs. Hartzel
A
Jennifer
O
Mr. Simon
AB
Rebecca
A
Mrs. Simon
AB
Holly
B
Mr. Peach
O
Mrs. Peach
O
23. A child has type A blood. What are ALL the possible blood types of its parents? Show each cross to prove that it is
possible.
24. If a homozygous blue bird is crossed with a homozygous yellow bird they produce blue and yellow offspring.
a.
Is this an example of codominance or incomplete dominance? Support your answer.
b.
Show a cross between two birds that are Blue and Yellow. What are the phenotypes of the offspring and
in what proportion?
I
II
III
The pedigree above shows the inheritance of blue eyes in a family. Blue eyes are a recessive condition. Use the pedigree
above to answer the following questions.
25. What is the relationship between Individual I-1 and III-2?
26. Explain whether Individuals II-2, II-4, and II-7 are Homozygous Dominant, Homozygous Recessive or
Heterozygous.
27. Is there any way of predicting the genotype of individual II-5? Support your answer.
28. Should individual III-1 marry a woman who is Heterozygous, what chance will they have of having a child with blue
eyes?