Genetics Test Review
Name____________________________
1. Who determines the sex of offspring in human?_________________
2. . What are the alleles for the blood types and which are dominant, codominant and
recessive.
A
B
AB
O
3. What is a sex-linked disorder? __________________________________________
Which chromosome is it more likely found on?________________________________
Give 3 examples _________________________________________________________
Create a Punnett Square: If color-blindness is X linked, recessive, mom is a carrier and
dad is normal. What are the phenotype ratios for the boys and girls offspring.
4. Who is Gregor Mendel?_________________________________________________
What did he study and why?________________________________________________
What did he call traits or genes?___________________________________________
Explain Mendels two principles?_____________________________________________
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
5. What are alleles? _____________________________________________________
6. What are dominant and recessive alleles? How are they shown?________________
______________________________________________________________________
7. What is probability?_________________________________________________
How is probability used in genetics?__________________________________________
8. What are the chances of flipping a coin and getting heads?___________, 3 heads in a
row?_______.
9. What is homozygous?___________________________________________ How is it
represented?______________________________________________________
10. If homozygous yellow dominant plant is crossed with a homozygous green receesive
plant , . Then cross the F1 offspring: what is the
P1 geneotypes:__________ ____________
F1 Offspring phenotype_____________________ Genotype___________________
F2 offspring phenotypes ________,________,_______ Genotype ratio_______________
Create Punnett Squares: Identify the P generation, F1, F2
11. What is incomplete dominance?___________________________________
Show an example below (Punnett Square)
12. What is codominance?__________________________________________________
Show an example below:
13. What is a karyotype?
14. How many chromosomes are in the human karyotype?
15. In humans, male 23 chromosome pair are__________ and females are____________
16. What are multiple alleles? Give an example.
17. In cat, long hair recessive to short hair. Also black and tan fur is recessive to black
fur. A heterozygous, shorthaired, black cat is mated to a black and tan, longhaired cat.
Make a Punnett Square and state the phenotypic ratios of their kittens.
18. Hemophilia (Bleeder’s Disease) is a sex-linked characteristic in humans. Could a
normal man and a normal woman who carries the allele for the disease have a daughter
with hemophilia? Using a Punnett Square explain why or why not?
19. In horses, black is dominant to chestnut (dark brown) coat color. The trotting gait is
dominant to the pacing gait (different breeds of horses move differently). A homozygous
black pacer is mated to a homozygous chestnut trotter. Make a Punnett Square and State
the phenotypic ratios of the offspring.
20. Yellow guinea pigs crossed with white ones always produce cream-colored
offspring. Two cream colored guinea pigs, when crossed, produced yellow, cream and
white offspring in the ratio of 1 yellow: 2 cream: 1 white. Explain the pattern of
inheritance demonstrated in this example.
21. In human, blood types are determined by multiple alleles – A, B, and O. Types A
and B are co-dominant to each other but both are dominant over O. Make a Punnett
Square and tell what are the possible genotypes of the father if the child is type A and the
mother is type O?
22. A set of parents claim they have been given the wrong baby at the hospital. Both
parents have type A blood. The baby has type O blood. Were they given the wrong
baby? Explain and make a Punnett Square.
** Cross the following: Two plants both Heterozygous Round Heterozygous Yellow
This is a _________________ or two traits being crossed.
Create the Punnett Square
How many different allele combinations would be found in the gametes?___________
How many different phenotypes are there?__________________