Trustworthy
How do genetic carriers differ from individuals expressing a genetic condition?
A) They cannot transmit genetic traits
B) They have one copy of the allele
C) They are immune to genetic disorders
D) They always have visible symptoms
B) They have one copy of the allele
In DNA replication, what does "semi-conservative" mean?
A) Only half the DNA is replicated
B) One original strand is preserved in each new DNA molecule
C) Important DNA segments are conserved
D) Replication occurs in alternate chromosomes
B) One original strand is preserved in each new DNA molecule
Meiosis results in (doubling or halving) the number of chromosomes in the original cell.
Halving
Down syndrome is most commonly caused by:
A) DNA replication errors
B) Nondisjunction during meiosis
C) Environmental mutations
D) Deliberate chromosome changes
B) Nondisjunction during meiosis
What characterizes a substitution mutation?
A) Changing chromosome numbers
B) Altering a single nucleotide
C) Duplicating entire gene sequences
D) Removing genetic material
B) Altering a single nucleotide
Speciation is most likely triggered by:
A) Genetic equilibrium
B) Identical environmental conditions
C) Competition for resources
D) Chromosome duplication
C) Competition for resources
Different versions of genes
Alleles
How is DNA Organized? (Gene, Chromosome, DNA)
Chromosomes → DNA → Genes
Gametes are produced through a process called ...?
Meiosis
If two carrier parents have a child, what's the probability of the child having sickle cell disease? (Must show Punnett Square) 1 minute
A) 25%
B) 50%
C) 75%
D) 100%
A) 25%
What type of natural selection shows the trait increasing for one extreme only (one direction)?
Directional Selection
DAILY DOUBLE: Which part of the DNA structure is different in living organism?
The order of amino acids
What makes a trait recessive?
It requires two identical alleles to express
What best describes natural selection?
Survival of most adaptable traits
What type of natural selection shows only the extreme traits increasing (middle is decreasing)?
Disruptive Selection
Code this protein into RNA:
TGC-ATT-CCG
ACG-UAA-GGC
How do genetic carriers differ from individuals expressing a genetic condition?
They have one copy of the allele (recessive).
What 2 types of mutations are the most dangerous?
Insertion and Deletion
DAILY DOUBLE: Why is DNA semi-conservative?
Each DNA molecule consists of one original and one new strand of DNA.
What is created in Transcription?
mRNA (copy)
Down syndrome is most commonly caused by:
A) DNA replication errors
B) Nondisjunction during meiosis
C) Environmental mutations
D) Deliberate chromosome changes
B) Nondisjunction during meiosis
What is created in Translation?
A Protein
What type of natural selection shows only the average trait increasing?
Stabilizing Selection.
What can happen to a protein if a mutation causes a stop codon to stop the production of a protein early?
It can create a non-functional protein.
A group of 3 nucleotides is called...?
A codon