Practice Test 4 Flashcards
_________________ are the segments of DNA on a chromosome that code for a trait. _________________ are specifically what a gene codes for.
genes
alleles
Toe size is an inherited trait. A huge toed man and normal toed woman have all huge toed children, which is the dominant trait?
huge toes
In a breed of dogs, yellow coat color is dominant, while black coat color is recessive. Which of the following genotypes would produce a black puppy?
1) AA
2) Aa
3) aa
3 only
If two heterozygous dogs from question #5 had puppies, what would be the GENOTYPIC ratio of their offspring?
1AA, 2Aa, 1aa
If a homozygous recessive dog and a homozygous dominant dog from question #5 had puppies, what would be the PHENOTYPIC ratio of their offspring?
4 yellow 0 black
A woman with A-type blood has a daughter with a man who has B-type blood. In order to have an O-type baby, the mother’s genotype must be ____ and the father’s genotype must be ____.
Ao
Bo
or
Ai
Bi
Colorblindness is an X-linked recessive disorder. What are the chances a woman with the genotype XBXb and a man with the genotype XBY can have a colorblind daughter?
0
Marfan syndrome is an example of _______________________.
pleiotrophy
Which of the following are examples of polygenic traits?
skin color and height
RNA is a _______ stranded molecule that contains the bases _______.
single
AUCG
In replication, one _____ template strand is used to make two _____ daughter strands.
DNA
DNA
Which enzyme unzips DNA during replication?
helicase
DNA is used as a template to make mRNA during ________
transcription
________________________ adds nucleotides during transcription.
RNA polymerase
A codon is:
three sequential bases found in mRNA
