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WorksheetsGenetics Quiz Review (NC7L2.1-2.2)
Total questions: 15
Worksheet time: 8mins
Brown eyes (B) are dominant over blue eyes (b). Parents with the genotypes of BB and Bb have several children. What is the phenotype of the children?
BB
Bb
blue eyes
brown eyes
Organisms that reproduce sexually have offspring with greater variety. Which statement best explains this characteristic?
The offspring get DNA from one parent, and it mutates readily.
The offspring get DNA from two parents, and it mutates readily.
The offspring get DNA from one parent, and it combines randomly.
The offspring get DNA from two parents, and it combines randomly.
Which parts of a cell determine the traits an organism inherits?
chromosomes
mitochondria
ribosomes
vacuoles
A gamete involved in sexual reproduction only contains half a set of DNA. Where does the other half of the DNA come from when forming an offspring?
a body cell
a gene mutation
a second gamete from another parent
a second gamete from the same parent
Which process results in offspring having the same number of chromosomes as a parent after asexual reproduction?
fertilization
fracturing
meiosis
mitosis
Having freckles is dominant over unfreckled skin. Will all people who have freckles have the same genotype?
yes, because genotypes and phenotypes always match
no, because people can have the same phenotype with different genotypes
no, because many people get freckles from environmental influences, not genes
yes, because people with the same phenotype always have the same genotype
Blue eyes result from a recessive trait. James and Pamela both have brown eyes, although they are heterozygous for the trait. Which is the probability their offspring will have blue eyes?
25%
50%
75%
100%
Having freckles is a dominant trait. Which statement about the offspring of two heterozygous (Ff) freckled parents is true?
50% of the offspring would be heterozygous with freckles.
50% of the offspring would be heterozygous without freckles.
50% of the offspring would be homozygous dominant with freckles.
50% of the offspring would be homozygous recessive without freckles.
Two tall plants (homozygous dominant) are crossed. What are the expected phenotypes of the offspring?
all tall plants
all short plants
some tall plants and some short plants
one tall plant and the rest short plants
In spiders, a hairy body (H) is dominant to a bald body (h). Two spiders that are heterozygous for body type are crossed. Which genotypes are produced in the offspring?
HH, Hh, and hh
HH and Hh
Hh and hh
Hh only
A species of tree can have round leaves (R) or oval leaves (r). Which are the most likely genotypes of the parents if 75% of the offspring have round leaves?
rr, rr
Rr, Rr
RR, RR
Rr, rr
In spiders, a hairy body (H) is dominant to a bald body (h). All offspring have the genotype Hh. What are the genotypes of the spider parents?
HH and Hh
HH and hh
Hh and Hh
Hh and hh
. Aspen trees can have round leaves (R) or oval leaves (r). What are the phenotypes of the offspring if the parents are homozygous dominant?
75% round, 25% oval
25% round, 75% oval
100% round
100% oval
Two brown-eyed dogs have 5 puppies. Four of the puppies have brown eyes, but one puppy has blue eyes. What can be inferred about the genotypes of the parents?
Both parents are heterozygous.
Both parents are homozygous recessive.
Both parents are homozygous dominant.
One parent is heterozygous, while one is homozygous dominant.
What can be inferred if a trait is carried by a dominant allele?
The trait often skips a generation.
The trait often appears in every generation.
The trait is often hidden in most of the offspring.
The trait is often hidden in the parent organisms.
