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Study Guide – Genetics and Heredity
Name ________________________
1) What is genetics –
2) What is heredity -
3) Determine which of the following traits are controlled by genetics only, the environment only or influenced by
both genetics and the environment. Place an X in the appropriate column.
Characteristic
Genetic Control
Environmental
Control
Genetic &
Environmental
Tongue rolling
Favorite music
Language spoken
Athletic ability
Dimples
Body weight
4) Choose one of the traits above that you believe to be under both genetic and environmental control and explain
the possible combination of effects (how is this trait impacted by both genetics and the environment?).
WORD CHOICES FOR 5 and 6: genotype, phenotype, purebred, hybrid
5) Heterozygous = ________________________ = the two alleles (letters) are different
Homozygous = ________________________ = the two alleles (letters) are the same
6) Inherited traits = ________________________ = written as a combination of letters (ex. TT, Tt or tt)
Inherited physical appearance = _____________________ = written as a description (ex. tall or short)
7) For each genotype below, indicate whether it is heterozygous (He) or homozygous (Ho).
HH ____
Cc ____
DD ____
Tt ____
bb ____
Nn ____
ff ____
KK ____
Jj ____
aa ____
LL ____
Zz ____
Which of the genotypes above would be considered purebred? List each.
Which of the genotypes above would be considered to be hybrid? List each.
Study Guide – Genetics and Heredity
Name ________________________
8) Determine the phenotype for each genotype using the information provided about the cat.
Black fur (B) is dominant to white (b).
BB_______________ Bb________________ bb______________
Short whiskers (S) are dominant to long (s).
SS_______________ Ss________________
ss ______________
9) For each phenotype, give the genotypes that are possible.
Purple flowers (P) are dominant to white (p).
Purple= ____________________
White= _____________________
Green pea pods (G) are dominant to yellow (g).
Green= ____________________
Yellow= _____________________
10) On the Family Guy, Stewie has a football shaped head but both of his parents have a round head (round heads
are dominant). Stewie starts to wonder if he could have been adopted. Using the five steps, show if it is possible
for Stewie to be the biological son if his parents Peter and Lois. If it is possible, what must the genotypes of the
parents have been?
11)
In angelfish, red color is dominant and green color is recessive. A heterozygous
dominant male is crossed with a homozygous green female. Show all steps!!
12) List 5 facts about Gregor Mendel and genetics and what he studied in pea plants.
13) Describe the connection between genes, DNA and chromosomes.