Vocabulary
In the gene combination Gg for pod color, g is the ____________ allele.
recessive
In order to show all of the possible combinations of alleles from parents, we use:
A) punnett squares
B) phenotypes
C) genotypes
D) None of the above
A) Punnett squares
The phenotype is the form of a trait that an organism displays.
true
When a true-breeding purple plant (PP) is crossed with a true-breeding white plant (Pp) the genotype(s) of the offspring is _____________.
Pp, PP
When the phenotypes of two alleles blend together, it is called incomplete dominance. What is an example of incomplete dominance?
red flower + white flower = pink flower
A ____ is a unit that determines traits.
gene
What happens to alleles during meiosis?
A) Alleles separate
B) Alleles combine
C) Alleles are created
D) Nothing happens
A) Alleles seperate
A tabby cat is an example of incomplete dominance
false!
that is codominance
DAILY DOUBLE
Genes are located on ____________ .
chromosomes
A ____________ allele is usually represented by a capital letter.
dominant
An organisms genotype describes:
a) the form of a trait it displays
b) its physical characteristics
c) the way it looks
d) the alleles of the gene it contains
alleles of the gene it contains
Having free earlobes is a dominant trait in humans. Your best friend has free earlobes. From this information you know that his/her genotype for earlobes must be ff.
false
it should be Ff or FF
Skin color in humans is determined by several different genes. This is an example of what pattern of inheritance?
polygenetic traits
A characteristic that an organism can pass on to its offspring is called a ________.
trait
If a pea plant contains a recessive allele for wrinkled seeds and a dominant allele for smooth seeds, the organism’s phenotype must be:
a) smooth seeds
b) wrinkled seeds
c) half of the seeds are smooth and half are wrinkled
smooth seeds
Mendel found that the ratio of purple flowers to white flowers was 3:1 in the second generation of offspring
true
When fertilization occurs, offspring inherit ______ homologous chromosome in a pair from each parent.
one
An organism’s ____________ is the set of traits it receives from its parents.
heredity
In ____________ of flowers, the parts that contain pollen are removed from one plant so it cannot self-pollinate.
a) self polination
b) cross pollination
c) polygenic pollination
cross pollination
When a true-breeding plant self-pollinates, it always produces offspring with different traits as the parent plant.
false
the traits are the same!
Using a Punnett square, what is the ratio of round seeds (R) to wrinkled seeds (r) when a plant with round seeds (Rr) is crossed with a plant with wrinkled seeds (rr)?
2:2
or
1:1