Transcript Genetics Jeopardyx

Jeopardy
Inheritance
Vocabulary
Inheritance II
Who’s the
parent?
Ratios
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Final Jeopardy
If both parents are heterozygous for
type B blood, what two blood types
could their children have?
B and O (BB, BO, OO)
You cross a grey hen with a grey rooster.
However, you end up with 10 grey
chicks, 5 white chicks and 5 black chicks.
What process best explains what
happened?
Incomplete dominance
You have type AB blood and you
need a transfusion. Which blood
types can give you blood?
AB, A, B, O (all types)
Is it possible for an A blood Type parent
and a B blood Type parent to have a child
with O Blood Type? Explain
Yes, If both parents are
Heterozygous (AO & BO) then
there is a 25% chance to have a
child with
Type O Blood (OO)
You know that if you cross two purple
flowers of a certain plant, you will get blue,
red and purple flowers. What two colors
should you cross to get the most purple
flowers in the offspring?
Red and blue
(all offspring will be purple)
If an individual’s genotype has two different
alleles for the same trait, that organism is
said to be what?
Heterozygous
In humans, what is the only
chromosome pair that is not autosomal?
Pair 23
The sex chromosomes
If an individual has a genotype of DD,
what two words best describe it?
(be very specific)
Homozygous dominant
What do we call a family tree that
uses a circle or a square for each
family member?
Pedigree
What is the difference between
codominance and incomplete
dominance?
In codominance, both alleles are fully
expressed (e.g. type AB blood). In
incomplete dominance, the
heterozygote exhibits a blend of both
alleles (e.g. red and white flowers
make pink).
What is a sex-linked trait?
A trait that is determined by a gene
found on the sex (X) chromosome.
If a phenotypically normal woman has
a colorblind girl, what phenotype does
the father exhibit?
The father is colorblind.
The alleles for hemophilia,
colorblindness and some types
of muscular dystrophy are
located on what chromosome?
The X Chromosome
What is the genotype for a girl that
carries the gene for hemophilia, but
doesn’t have the disorder?
XHXh
Or
Xh X
Why are more males affected by Xlinked disorders?
They only receive one copy of the X
chromosome, so they can be
affected by any dominant or
recessive disorder. The Y
chromosome doesn’t have the
corresponding allele to cancel out
any recessive trait on the X
chromosome.
Blue eyes (b) are recessive to
brown eyes (B)
A dad and all three children have
blue eyes. What genotype(s) could
the mother be?
Bb or bb
(B=brown, b=blue)
Freckles are dominant. If a woman
without freckles has two children with
freckles and three without, what
genotype is the father?
He has freckles (Ff)
In a family, both children have type A
blood. Their dad is type O. What
blood types could the mother be?
Types A, AB (AA, AO, AB)
You breed two flowers that exhibit
incomplete dominance with white and red.
One of the parents has white flowers. The
offspring are half white and half pink. What
color was the other parent?
Pink (FWFR)
Or
Pink (WR)
If a mom has hemophilia and all her
children (both boys and girls) have
hemophilia, what is the genotype of
the father?
Xh Y
Two plants that are heterozygous for
the tall gene (Tt) are crossed. What
is genotypic ratio of their children?
1TT : 2Tt : 1tt
In cats, long hair (L) is dominant over
short hair (l). If you breed a homozygous
dominant cat with a heterozygous cat,
what phenotypic ratio would their
children exhibit?
Phenotype = 4:0
All long haired
Genotype =1LL : 1Ll
(or 2LL:2Ll)
We breed two plants that are
heterozygous for leaf shape. Round
leaves (R) are dominant over oval leaves
(r). What percentage of their offspring
will have oval leaves?
25%
In rabbits, short ears(S) are dominant
over long ears(s). We test cross a
phenotypically normal rabbit with a
homozygous recessive rabbit. If the
genotype of the normal rabbit is Ss,
what percentage of the offspring would
we expect to be long-eared?
50%
In plants, round leaves (R) are
dominant over oval leaves (r). Also,
mottled leaves (M) are dominant over
non-mottled leaves (m). Two plants
that heterozygous for both traits
(RrMm) are crossed. What is the
phenotypic ratio for this cross?
9 round, mottled :
3 round, non-mottled :
3 oval, mottled :
1 oval, non-mottled
Final Jeopardy
In some animals, black whiskers
(B) are dominant over white
whiskers (b). Draw a Punnett
Square that meets the following
phenotypical ratio: 3 black:1 white
Final Jeopardy Answer
B
b
B
BB
Bb
b
Bb
bb