Meiosis
Meiosis
What is the Genotype "AA" an example of?
Homozygous Dominant
A dihybrid cross is only used when...
there are 2 traits
An inheritance pattern where two alleles are expressed equally, neither allele is dominant or recessive (ex. Blood Type)
Codominance
the process that occurs during prophase 1 that allows for chromosomes to exchange genetic information
Crossing over
What percentage of the offspring from this cross would inherit the dominant allele?
Rr x Rr
Make a KEY for the problem: Tall is dominant to short and green is dominant to yellow.
Tall = short = Green = yellow =
Tall= T Short= t Green= G yellow=g
Incomplete dominance
4 different haploid cells
determine the parents for the following cross:
Tall is dominant to short. A heterozygous Tall plant is crossed with a homozygous recessive short plant.
Tt x tt
A genetic cross involving two unlinked genes is represented below.
GgHH x ggHh
Which of the following combinations can they make together? (write all that are correct)
GGHh GgHH ggHH gghh
GgHH, ggHH
A homozygous red-flowered snapdragon (RR) is crossed with a heterozygous pink snapdragon (RW). What would be the percentage of pink flowers?
50%
46
Is it possible for a brown haired (BB) parent and a red haired (bb) parent to have a child with red hair?
no (0)
determine the parents of the following cross
B: Black Bears b: white bears
F: Wavy fur f: straight fur
Heterozygous black fur and heterozygous wavy fur crossed with a white fur and Homozygous dominant for wavy fur.
BbFf x bbFF
B:Black W: White BW: Speckled
Cross a black chicken and a speckled chicken. How many of the offspring will be white?
0
Which of these is the most likely the result of crossing over?
A Chromosome replication will cease to avoid errors that result in mutations.
B Offspring will no longer express traits from previous generations.
C Gametes will contain new allele combinations.
D Chromatids will have less genetic variety.
C Gametes will contain new allele combinations.
If a red flower (EE) is cross bred with a yellow flower (ee), how many different phenotypes are possible?
one (Ee)
LlBb x Llbb
L: long trunk l: short trunks
B: Big ears b: small ears
Complete the Punnett square for each trait and determine the probability of long trunk with small ears offspring.
6- Long trunk with small ears
Blood type: Use your notes to determine the genotypes
A type O person has children with a type AB person. What are the possible phenotypes of the offspring?
IA or IB