Download Name - Humble ISD

Name: ________________________________________ Period: ____ Date: ________________________
Review for Meiosis and Genetics Test: (Tuesday, 2/7/12)
Compare and Contrast Mitosis and Meiosis: Using a Venn Diagram and the following terms – somatic cells,
gametes, haploid, diploid, crossing over, pairing of homologous chromosomes, two divisions, sexual
reproduction, growth,
Mitosis
Both
Meiosis
Meiosis takes place to create _______________________ cells called __________ and ______________.
__________________ cells contain half the number of ______________________________________.
Circle the correct answer in each set of parentheses: The end result of meiosis is ( two or four )
( haploid or diploid ) ( similar or different ) ( gamete or somatic ) cells.
Draw meiosis of a male gamete:
Draw Meiosis of a female gamete:
If a diploid cell (2N) has 78 chromosomes, how many chromosomes will its haploid cell have? __________
Crossing over results in genetic __________________________________ among individuals in a population.
MATCH THE FOLLOWING VOCABULARY WITH ITS CORRECT DEFINITION:
_____ Genetics
a.
a trait that is most often visible
_____ Dominant
b.
the physical appearance of a trait
_____ Recessive
c.
the study of inheritance of traits
_____ Phenotype
d.
having 2 different alleles for a particular trait
_____ Genotype
e.
a trait that is often hidden in the presence of
dominance
_____ Homozygous
f.
the genetic make up of an organism
_____ Heterozygous
g.
having 2 identical alleles for a particular trait
Purple eyes occur more often in flamingos than pink eyes. This is all due to the Principle of ____________.
Variation of traits in populations occur because of the Principle of _________________________________.
The Principle of ______________________________ states there is a 50/50 chance of inheriting a specific
trait.
When neither allele has complete dominance over the other, it is called ________________________
dominance.
When two dominant alleles are both expressed in organisms, it is called ____________________________.
PUNNETT SQUARE PRACTICE:
SpongeBob Square Pants recently met SpongeSusie Roundpants at a dance. SpongeBob is heterozygous
for his Square Shape (Ss) but SpongeSusie is round (s).
Cross SpongeBob and SpongeSusie. ___________ x ______________
Genotype ratio:_____________________________________
Phenotype ratio: ___________________________________
Patrick met Patti at the dance. Both of them are heterozygous for pink body color (which is dominant over
yellow color).
Cross Patrick and Patti. ________ X ________
Genotype %:_____________________________________
Phenotype %: ___________________________________
For each genotype below, indicate whether it is heterozygous (He) or Homozygous (Ho).
_____ TT
_____ Bb
_____ff
_____ DD
a.
Which of the genotypes would be considered a purebred? ___________________
b.
Which of the genotypes would be considerd a hybrid? ______________________
Determine the phenotype for each genotype using the following information:
- Yellow body color is dominant over blue body
- Square shape is dominant over round shape
YY ___________ body
yy ______body
Yy ____________ body
Ss __________ shape
SS ___________ shape
ss __________shape
For each phenotype, give the genotypes that are possible for Patrick.
-A tall head (T) is dominant over a short head (t)
-A pink body (P) is dominant over a yellow body (p)
Tall = ________________ genotype short = _________genotype
Pink = _______________ genotype yellow = _______ genotype
PUNNETT SQUARE PRACTICE: Incomplete Dominance
In Andalusian fowls, black individuals (B) and white individuals (W) are homozygous. When crossed, they
produce an offspring that is bluish-gray (BW).
Cross a black andalusian fowl with an offspring (bluish-gray). _________ x _________
Genotype ratio:_____________________________________
Phenotype ratio: ___________________________________
Hair can be Straight (SS) or curly (CC) and you can produce offspring with wavy (SC) hair. Good example
of incomplete dominance.
Cross a curly hair female with a wavy haired male. ___________ X _______________
Genotype %: _______________________________________
Phenotype %: ______________________________________
___________________________________________________
A cross between a blue blahblah bird (BB) & a white blahblah bird (WW) produces offspring that are silver
(BW).
Cross two silver blahblah birds. ________ X _________
Genotype ratio:_____________________________________
Phenotype ratio: ___________________________________
SpongeBob loves growing flowers for his pal Sandy! Her favorite flowers, Poofkins, are found in red,
blue, and when crossed produce Poofkins that are purple. Use the information provided and your
knowledge of incomplete dominance to complete each section below.
Write the correct genotype for each color if R represents a red gene and B represents a blue gene.
KEY:
Red - _____ Blue - ______ Purple - _____
What would happen if SpongeBob crossed a Poofkin with red flowers with a Poofkin with blue flowers.
Complete the Punnett square to determine the chances of each flower color.
________ X _________
Genotype ratio:_____________________________________
Phenotype ratio: ___________________________________
PUNNETT SQUARE PRACTICE: CODOMINANCE
Cattle can be red (RR = all red hairs), white (WW = all white hairs), or roan (RW = red & white hairs
together). A good example of codominance.
Cross a homozygous white cow with a roan bull. _____________ X ___________
Genotype ratio:_____________________________________
Phenotype ratio: ____________________________________
In Whoville, Who’s can have curly hair (CC), spiked hair (SS) or a mixture of both curly and spiked (CS).
Cross Larry Who with spiked hair, with Lori Who with both curly and spiked
hair. ____________ X ______________
Genotype % :_________________________________
Phenotype %: ________________________________
In Smileys, eye shape can be starred, circular, or a circle with a star.
Cross a circle eye smiley with a circle-star eyed smiley. __________ X __________
Genotype ratio :________________________________________
Phenotype ratio: _______________________________________