Download The allele for brown eyes is dominant over that for blue eyes. Would

The allele for brown eyes is dominant over that for blue eyes. Would you expect
two blue eyed people to have a brown eyed child?
If you know a father has two alleles for brown eyes and the mother has blue eyes.
What color eyes would you expect the child to have?
Two brown eyed people sometimes have a blue eyed baby. Can you predict the
probability of a blue eyed child if all you know is the parents’ eye color?
Men only have a single X chromosome. Which parent does it come from?
Marge carries one allele for color blindness and one normal allele on her X
chromosomes. She has twelve children. How many could you expect to be color
blind?
Could she have a color blind daughter? How?
While females carry two X chromosomes, only one will be active in a cell and it
isn’t always the same one between cells. What would you expect to happen if a
gene for skin color was on the X chromosome and a women had two different
alleles?
Why was hemophilia so prevalent in European royal families?
If a woman has hemophilia, what are the odds that her son will have hemophilia?
If she has a child with man that doesn’t have hemophilia, what are the chances a
daughter would have hemophilia?
A happy blue eyed couple is expecting a child. When the baby is born it has brown
eyes? How do you explain this?
Why are calico cats female?
Can you think of a situation where a male calico would be born?
What is the difference between genotype and phenotype?
Linked genes. There are two genes located the 13th chromosome (shown below) of
unicorns. One makes their horn twisted (T) and the other makes their fur long (F).
Capital letters indicate the dominate gene.
T
f
t
F
T
f
t
F
A mating unicorn couple has the 13th chromosomes shown above. They have many
baby unicorns. What percentage of phenotypes would you expect to see?
What would the ratio be if these genes were on different chromosomes? Explain.
Use a Punnett’s square.
Would you expect to see a different ratio if the genes were further apart on the
chromosome? How?
T
t
F
f
ABO blood types. The genes for A or B are expressed on the outside of your
blood cells. Blood type (o) indicates a lack of either A or B.
Both parents are AB. What ratio would you expect to see in their children’s blood
types? Use a Punnett’s square.
Two parents are (Ao) and (Bo). What ratio would you expect to see in their
children’s blood types?
Would you expect to see two (o) blood type parents produce offspring with an (A)
or (B) blood type? Why?
Can you predict if the frequency of (o) blood type if one parent is (A) and the other
is (B)? Explain.
What information is needed to answer the previous question?
Explain a situation where parents that are (A) and a (B) can have an (o) blood type
child.
A purple flowered plant and a white flowered plant cross and produce all pink
flowered offspring. Explain how this would happen.
What genotypic and phenotypic ratios would you expect to see if the pink flowered
plants self pollinated? Use a Punnett’s square.
Bigfoot. A gene for hair color in Sasquatch determines if they have brown fur. (B)
is dominant so an individual has to have two copies of (b) in order to have white
fur otherwise any(B) gene present will result in brown fur. A couple both have
(Bb) genotypes.
What gametes would each parent produce?
Draw a Punnett’s square to show how many children will have white fur and
brown fur.
Long ago a group of humans left earth and started to colonize a new planet. They
evolved to adjust to a different atmosphere and a diet of only squirrels and acorns.
Apparently some squirrels and their cache of acorns hitched a ride on the spaceship
and established themselves. Once the humans’ food supply ran out, squirrels and
acorns were the only things left that were edible. The tannins in the acorns caused
severe digestive problems for people who had two copies of a recessive allele (a)
and these people were always sick making them less likely to contribute to the
gene pool. Some of the people had a dominant allele (M) that allowed them to
breathe more efficiently in the new methane rich atmosphere. Those that did not
have this allele had many health problems and often smelled bad. As a result, the
recessive alleles (a) and (m) became rare. Another recessive allele (s) is located on
the X chromosome and causes kidney failure for people who eat too high of a
proportion of protein in their diet and don’t have a copy of (S). Squirrels are very
high in protein. Another recessive allele (d) is located on the same chromosome as
(M or m) and causes severe deadly allergies to acorns.
If a couple trying to help populate the planet both carry recessive traits for two
genes (Mm/Aa/SS or S_), what proportion of their children could live a healthy life
in this environment? Use a Punnett square and show how you got this ratio.
A very promiscuous man with kidney failure is doing his part to populate the
planet at the local bar. He meets several women a week. If he meets a woman with
(Ss) genes for squirrel digestion and the meeting results in a baby, what are the
odds that a male child will have kidney failure from eating too many squirrels?
What are the odds that a female child had the same condition?
If he meets a woman with (SS) genotype, what are the odds of the children having
this condition? (Tell me both male and female ratios)
If he meets a woman with (ss) genotype, what are the odds of the children having
this condition? (Tell me both male and female ratios)
If he meets a woman with an unknown genotype, what are the odds of the children
having this condition? (Tell me both male and female ratios)
Create a Punnett square with parents being (AaMMDDS_) and (AaMMDdss) and
tell me the conditions of the male and female children.
What fake genes would be better next time I teach this? Create two unlinked genes
and make a Punnett square assuming both parents are heterozygous.