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Genetics Test Retake Packet
Biology Textbook: Chapters 11 and 14
Accelerated Biology Textbook: Chapter 9
1. What type of inheritance is shown when you cross a red cow (RR) and a white bull (WW),
which gives a roan offspring (RW)? ________________________________
2. What type of offspring does selective breeding produce? _______________________________
_______________________________________________________________________________
3. The principles of probability can be used to predict ____________________________________
_______________________________________________________________________________
4. P generation: Cross a true-breeding tall plant with a true-breeding short plant.
a.
b. Are all of the offspring in the F1 generation homozygous or heterozygous? _________________
c. Do they have the same genotype as either of the parents? _________________
d. Do they have the same phenotype as either of the parents? ________________
e. Cross two of the offspring from the F1 generation.
f. What is the probability that a plant in the F2 generation will be tall? ________%
5. Organisms with two identical alleles for a particular trait are said to be ________________.
6. Organisms with two different alleles for a particular trait are said to be ________________.
7. In hamsters, black fur is dominant and white fur is recessive.
a. Identify the alleles:
B=
b=
b. Cross a heterozygous hamster with a hamster that is homozygous dominant.
c. What is the genotypic ratio? __________________________
d. What is the phenotypic ratio? _________________________
8. Can a punnett square show the actual results of a genetic cross? ___________ Why or why not?
_______________________________________________________________________________
_______________________________________________________________________________
9. How many different allele combinations would be found in the gametes produced by a plant
with the following genotype, GGYy. (Hint: use FOIL) _________________
10. a. Cross the following heterozygous parents: Nn x Nn
b. How is it possible that these parents could get an offspring with the genotype, nn? (Check all
that apply)
__________ Principle of Dominance: some alleles are dominant and some are recessive
__________ Principle of Segregation: two alleles (Nn) are segregated from each other so each
gamete carries only a single copy of each gene (N or n).
__________ Principle of Independent Assortment: genes for different traits (seed color & seed
shape for example) can segregate independently during gamete formation.
11. What is the ultimate source of genetic variability? (page 320) ________________________
12. Write the two genotypes for the blood type A phenotype ____________ or ______________
13. Write the two genotypes for the blood type B phenotype ____________ or ______________
14. What is the genotype for blood type AB? ______________
15. What is the genotype for blood type O? _______________
16. What could be possible blood types of the offspring if a man had blood type A and a woman
had blood type O? (Remember: type a has 2 possible genotypes  make two punnett squares)
Possible offspring blood types: ________________________________________
17. How is sickle cell caused? ______________________________________________________
_______________________________________________________________________________
18. Why are people heterozygous for sickle cell usually healthy?
19. What is the probability that a human offspring will be female? ______%
20. What is the probability that a human offspring will be male? _______%
21. Many sex-linked genes are located on which chromosome? ____________
Why? _____________________________________________________________________
22. Why is colorblindness more common in males than in females? _________________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
23. Which of the sex chromosomes sometimes forms a Barr Body? _________
24. Does a Barr Body form in males or females? ____________________
25. What sex would a calico cat be if it had three colors: white, orange, and black? __________
26. For a trait associated with the autosomal chromosomes, not the sex chromosomes, how many
recessive alleles for a trait must an organism inherit in order to show that trait? _________
27. In a two trait cross, in which both parents are heterozygous for each trait, what would the
phenotypic ration always be? ____:____:_____:_____.
More on Genetics
28a. What is incomplete dominance?
b. What is codominance?
29.What is the genotype of individual 1 in Figure 14-2?
30. What is the genotype of individual 2 in Figure 14-2?
31. In Figure 14-2, how many children of individuals 4 and 5 have attached earlobes?
32. What is the genotype of individual 5 in Figure 14-2?
33. What is the genotype and phenotype of individual 14 in Figure 14-2?
34. How many of the descendants of individuals 1 and 2 are homozygous for free earlobes?
35. Draw what it would look like if two homologous chromosomes did not separate.
What would this be called?