What Do I Look Like
In humans, tongue rolling is a dominant (R). I am RR- can I roll my tongue?
Yes, I can roll my tongue.
In mice, black fur (F) is dominant to white fur. What alleles does a white mouse have?
Two recessives (ff)
Humans have 23 chromosome pairs in their skin cell. How many chromosomes are in the egg cell of a female human?
23
Ann is a homozygote for tongue rolling (rolling is dominant R). Does she have any egg cells with r?
No
An organism’s physical appearance or visible traits
Phenotype
In plants, yellow pods are recessive (g) and green are dominant (G). A plant is (gg). What color are the pods?
Yellow
In pea plants, having a smooth pea is dominant to a wrinkled pea. A plant is smooth and homozygous. What alleles does it have?
Two smooth (WW)
Cows have 60 chromosomes. How many chromosomes are in a cow’s egg cell?
30
Dimples are dominant (D). Mary’s parents are both homozygotes and have no dimples. What percentage of Mary’s eggs have the allele for dimples (D)?
0%
The passing on of traits from parent to offspring
Heredity
In humans, freckles are dominant (F). Mike's mother doesn't have freckles but his father is homozygous dominant. Does Mike have freckles?
Yes
In fish gold color is recessive and brown is dominant. A fish is a heterozygote brown. What are its alleles?
One dominant brown, one recessive gold(Bb)
Barley plants have 7 chromosome pairs. How many chromosomes are in a barley’s sperm cell?
7
Almond shaped eyes are dominant. Jim has 4 children, two of them have almond eyes and two have round eyes. His wife, Jill, has round eyes. What percentage of her eggs have the allele for almond eyes?
0%
An organism’s genetic makeup or allele combination. What is expressed on the inside
Genotype
In humans almond shaped eyes are dominant (A). Both of Mark's parents have round eyes. What shape eyes does Mark have?
Round eyes
In humans almond shaped eyes are dominant to round shaped eyes. Jack has round eyes and his mother has almond eyes. What eye alleles does Jack's father have?
Either one round and one almond OR two round
Pea plants have 7 chromosomes in their sperm cells. How many chromosome pairs are in a pea leaf cell?
7
In grasshoppers males only have one (X) chromosome and females have two (XX). What percentage of a male’s sperm will result in female grasshoppers?
50%
BB or bb are examples of a _________ person
Homozygous
Green is a dominant pod color to yellow. Two plants are heterozygotes for pod color and they are crossed. What is the chance of the offspring being Green? Yellow?
75% Green; 25% Yellow
In plants red flower color is dominant to white. A plant has pink flowers. What are the flower’s alleles?
This is incomplete dominance. The plant has one red and one white, but they made a new color because one color does not over power the other color.
Male wallabies have 10 chromosomes but females have 11. How many chromosome pairs are in a skin cell from a female wallaby?
5 (only the egg gets the extra chromosome)
Jim is homozygote recessive for tongue rolling (can’t roll). Which eggs would you use to ensure that all his children can all roll their tongues? 400 points
a. Eggs from a woman who can roll her tongue
b. Eggs from a woman who can’t roll her tongue
c. Eggs from a woman who is homozygote for tongue rolling
d. You cannot choose eggs based on the alleles in them so there is no way to ensure tongue rolling
C
Any change in the DNA of a gene or a chromosome
Mutation