1. GENETICS Practice Chapter 3 & 4

2. G g G g GG Gg gg The parents in this cross are _____________ 75
Homozygous Heterozygous
Heterozygous G g GG Gg gg
If G is dominant for green pods and g is recessive for yellow pods, what percentage of the offspring will have green pods? _______% 75

3. B b
The genotype of the offspring in the blue box is _______ bb
The offspring in the blue box is
homozygous heterozygous
homozygous

4. Another name for pure is _________________ homozygous
In guinea pigs black fur (B) is dominant over brown fur (b). The Punnett square for a cross between a HETEROZYGOUS black guinea pig and a PURE brown guinea pig would look like B b B b B b B b
This is the
Correct setup
Heterozygous = Bb
Pure brown = bb
Another name for pure is _________________
homozygous

5. What is X? The human body has 46 chromosomes.
The chromosomes work in pairs, so there are 23 pairs of chromosomes.
22 out of the 23 pairs are the same for men and women.

6. What is Xy?
The other two are the ones that determine what gender you'll be.
A woman has two X chromosomes (X is the name of the chromosome) and a man has one X and one Y chromosome.
This means that when a man forms sperm, they can either have an X chromosome or a Y chromosome, while the female gametes can only have X

7. An organism has the genotype Xy.
What are the possible sperm it can produce?
______ ______
X y
THINK ABOUT IT:
If females have an XX genotype and can only give X genes, which parent is the one that determines whether the baby is a boy or girl?
Father ;
The mother always gives an X
If the father gives a y, it’s a boy.
If the father gives an X; it’s a girl.

8. Codominance The meaning of the prefix "co-" is "together"
Codominance The meaning of the prefix "co-" is "together". Cooperate = work together.  Coexist = exist together.  Cohabitat = habitat together
Alleles are neither dominant nor recessive .
As a result both alleles are expressed in the offspring.

9. Incomplete Dominance
Both forms of the trait show in a mixed form. (end up with something in-between )
Example: A cross between a blue blahblah bird & a white blahblah bird produces offspring that are silver. 
1) Notice that the offspring is showing a 3rd phenotype.  The parents each have one, and the offspring are different from the parents.
2) Notice that the trait in the offspring is a blend (mixing) of the parental traits.

10. SpongeBob loves growing flowers for his pal Sandy
SpongeBob loves growing flowers for his pal Sandy! Her favorite flowers, Poofkins, are found in red, blue, and purple. Use the information provided and your knowledge of incomplete dominance to complete each section below.
1. Write the correct genotype for each color if R represents a red gene and B represents a blue gene.
Red - _____ Blue - ______ Purple - _____ RR BB RB

11. If you cross a homozygous RED flowered four o’clock plant with a homozygous WHITE flowered plant, ALL of the offspring produced have PINK flowers.
This type of inheritance in which the heterozygote (Rr) shows a blending of traits is called __________.
A. Dominant/recessive inheritance
B. Co-dominance
C. Incomplete dominance
Incomplete dominance

12. Red throats (R) are dominant over white (r) throats in Goonie birds.
R r r
Red throats (R) are dominant over white (r)
throats in Goonie birds.
Make a cross between a PURE RECESSIVE and a HETEROZYGOUS Goonie bird.
Rr rr
Rr rr
50% red throats
50% white throats
What are the possible phenotypes of their offspring?
(% and color)