Title: PUNNETT SQUARES AND MORE
1Chapter 9 Review
2Define genotype.
- The genetic makeup of an organism
3Define allele.
- An alternate form of a gene.
4Define recessive.
- An allele that is hidden unless there are two of
them
5Define dominant.
- An allele that is fully expressed, it determines
the phenotype of an organism.
6What word refers to the physical appearance of an
organism?
7When doing a test cross, an organism with unknown
genotype is mated with one
- That is homozygous recessive for a trait
8What is a carrier?
- Someone heterozygous for a disease that shows no
symptoms but CAN pass it on to offpsring.
9John is blind, which is recessive. His parents
are NOT blind. What are their genotypes? Johns?
- Parents Heterozygous (for example Bb)
- John homozygous recessive (bb)
10Name some recessive disorders.
- Deafness
- Albinism
- Cystic Fibrosis
- PKU
- Sickle Cell
- Tay Sachs
11Name some dominant disorders.
- Dwarfism
- Althzimers
- Huntingtons disease
- High (hyper) cholesterol
12Name some sex linked disorders.
- Color blindness
- Baldness
- Hemophilia
- Muscular dystrophy
13If both alleles are expressed when someone is
heterozygous, we call this ______.
14What are the sex chromosomes of a man?
15Is blood type codominance or incomplete?
16How many sex chromosomes are in a sperm?
17Genes located on sex chromosomes are called
18Why do men get sex linked genes more often than
women?
- Men only need to have one recessive allele (on
their one X gene) in order to get the condition.
Women have to inherit 2, one on each X.
19Whats the name of the monk and what did he study?
20What is heterozygous?
- Two different alleles for the same trait, one
dominant and one recessive, written Bb.
21What are the 3 types of fetal screening?Which is
the LEAST invasive?
- Ultrasound, CVS, amniocentesis
- Ultrasound
22Skin color, due to many genes, is caused by
23Brown eyes (B) are dominant to blue (b). What is
the genotype of a heterozygous person.
24Brown eyes are dominant (B) to blue (b). White
hair (W) is dominant to gray (w). Whats the
genotype of blue eyes and grey hair?
25Brown eyes are dominant (B) to blue (b). White
hair (W) is dominant to gray (w). genotype. Bbww
26Purple flowers are dominant to white. Cross 2
heterozygous flowers. Whats the probability of
a white flower?
27Purple flowers are dominant to white. Cross a
heterozygous with a white. Whats the probability
of a white flower?
28Purple flowers are dominant to white. Cross two
homozygous purple flowers. Whats the
probability of a white flower?
29Brown eyes are dominant. A blue eyed child has
brown eyed parents. What are their genotypes?
30Brown eyes are dominant to blue. Two heterozygous
parents have a child. What is the probability
that the child will have brown eyes?
31Tall plants are dominant to short. A homozygous
tall and short plant are crossed. What is the
expected phenotypic ratio
32Purple flowers are dominant to white. Cross a
heterozygous with a white. If there are 400
babies, how many will be white?
33Incomplete dominance Red (RR), Pink (Rr), white
(rr). Cross a red and white and show your
phenotypic ratio.
34Incomplete dominance Red (RR), Pink (Rr), white
(rr). Cross two pinks. How many offspring will
be red?
35Incomplete dominance Red (RR), Pink (Rr), white
(rr). Cross 2 pinks and show the phenotypic ratio
36Incomplete dominance Red (RR), Pink (Rr), white
(rr). Cross 2 pinks and show the genotypic ratio
37A man has heterozygous B blood, a woman has
heterozygous A blood. What can their children
have?
38Mom has type A blood. Baby has type O. Dad 1 has
type AB and Dad 2 has type A. Who is the baby
daddy?
39A person with type AB can receive what blood
types?
- Any, AB is the universal receiver
- O is the universal donor.
40Color blindness is sex-linked. Cross a normal man
with a carrier woman. What are the chances a son
will be blind?
41Color blindness is sex-linked. Cross a normal man
with a carrier woman. What are the chances a
daughter will be blind?
42Color blindness is sex-linked. Cross a blind man
and a carrier. What are the chances a daughter
will be a carrier?
43Color blindness is sex-linked. Cross a blind man
and a blind woman. What are the chances a
daughter will be blind?
44Long (L) is dom to short (l) and yellow (Y) is
dom to green (y). Cross a homozygous long
heterozygous yellow with a short ?heterozygous
yellow bird. How many are LlYy?
45Using the same results, what proportion of
offspring will have long yellow feathers?
46Dark (D) is dom to light and Brown (B) is dom to
blue. Cross two people heterozygous for BOTH
traits. What is the prob of a light brown eyed
child?
47Dark (D) is dom to light and Brown (B) is dom to
blue. Cross a heterozygous dark heterozygous
brown with a light heterozygous brown. Show
phenotypic ratios.
- 6/16 dark brown, 6/16 light brown, 2/16 dark
blue, 2/16 light blue
48In pedigrees, circles represent
49A filled in circle or square means
- Someone has the condition or disease
- Genotype is homozygous recessive (aa)
50Horizontal lines between people indicate
- They are married or have offspring together