Genetics Review
Name_________________
Period_________________
Define the following crosses using the dominant allele for eye color is
black (B) and the recessive allele is red eyes (b):
1. Homozygous dominant X Homozygous dominant BB x BB
2. Heterozygous X Heterozygous Bb x Bb
3. Homozygous recessive X Heterozygous bb x Bb
4. Round, short, Rt. Handed Phenotype
5. EE, Rr, Ww Genotype
6. Probablity
Percentage
Use this punnett square to answer questions 9-12
?
?
TT
Tt
Tt
tt
?
?
7. What crosses would produce these offspring? ____Tt_________ x
___Tt___________
8. What percentage of the offspring are heterozygous? 50 %
9. What percentage of the offspring are homozygous recessive? 25 %
10. What percentage of the offspring are homozygous dominant? 25%
11.Where in the cell do you find the chromosomes? Nucleus
12.Give an example of three traits that can be influenced by the
environment. Height of plant: color of skin; hair color;
2010-2011
Genetics Review
Name_________________
Period_________________
13.Give 3 inherited traits from family members ?
Eye color; hair color; height;
14.What environmental conditions can affect the genes of different
species and cause them to change?
Sunlight; water; pollution; nutrition
15.In mice, the dominant allele for eye color is black (B), and the
recessive allele is Red eyes (b). If two heterozygous parents are crossed,
what will be all the possible genotypes and phenotypes? Draw a Punnett
square to prove your idea.
B – black
b - red
Phenoype:
Genotype: BB –25%____
__Black eyes__75%__ Bb – 50%
__Red Eyes___25%__ bb - 25%
16. What are two differences between asexual and sexual reproduction?
Asexual needs only one parent
Sexual needs 2 parents
17. Define the three types of asexual reproduction and match with the
picture.
a__
2010-2011
c__
Name
Period
b__
a. budding – offspring grows out of parent
b. binary fission –cells split and replicate DNA
c. fragmentation/regeneration – body of parent break and produce
offspring
18. Label the following.
*
*
*
*
*
*
*
*
19. Explain the function for the each of the organelles that has a * next to
them.
2010-2011