Variation And Selection In Populations - Genetics From Genes to Genomes

In 2013, a man was arrested for transporting 400 pounds of marijuana across state lines.His DNA was tested, entered into the CODIS database, and found to match the crime scene sample in a murder case (see Table).

\begin{array} { | l | c | c | } \hline & \text { Crime scene sample } & \text { Suspect 1 } \\\hline \text { SSR locus } 1 & 10,10 & 10,10 \\\hline \text { SSR locus } 2 & 11,11 & 11,11 \\\hline \text { SSR locus 3 } & 6,9 & 6,9 \\\hline\end{array}

-What additional evidence would increase your confidence that the man arrested for transporting marijuana committed the murder? (Select all that apply. )

A)A match between his blood and the crime scene sample at more than three SSR loci
B)A receipt that showed the man used his credit card in Texas on the night of the murder
C)The genotype at additional SSR loci that show a match at seven and a mismatch at three loci
D)Discovery of the man's fingerprints on the murder weapon

Answer

Question 2

(Multiple Choice)

Free

Why are many human recessive disease alleles maintained in populations despite continuing selection against them?

A)Heterozygotes have a higher fitness than either homozygote.
B)Mutations convert recessive alleles to dominant alleles.
C)Even when the allele frequency is low, many gametes contain the recessive allele.
D)Allele frequency remains constant from generation to generation.

Answer

Question 3

(Multiple Choice)

Free

What is the term for the loss of genetic variation due to an event that decreases the size of the entire population?

A)gene flow
B)genetic drift
C)founder effect
D)population bottleneck
E)selection

Answer