Review of Allele Frequencies & DNA profiling

If the frequency of recessive allele is 0.2, what is the frequency of the homozygous recessive individuals?

• 0.04

• 0.16

• 0.4

• 0.8

Answer explanation

The frequency of homozygous recessive individuals is 0.04, which is calculated by squaring the frequency of the recessive allele (0.2 x 0.2 = 0.04).

Tags

NGSS.HS-LS4-3

The allele frequency of p=.20 What is the frequency of the heterozygous genotype?

• .80

• .04

• .32

• .64

Answer explanation

This is a 2 step qestion.

1. Find q by plugging in p to the equation p + q = 1. You should get q = 0.8

2. Plug in p and q to 2pq to find the heterozygous frequency. 2(0.2)(0.8) = 0.32

Tags

NGSS.HS-LS3-3

A population of 150 individuals has an allele frequency of 0.3 for the dominant allele (B) and a frequency of 0.7 for the recessive allele (b). Use the Hardy-Weinberg equation to determine the frequency of the genotype (bb).

• 0.09

• 0.42

• 0.49

• 0.21

Answer explanation

This question gives you p and q. It is asking you to find the recessive genotype, which is q². Use q (0.7) and square it to find the correct answer.

(0.7)² or 0.7 x 0.7 = 0.49

Which Hardy-Weinberg factor represents the frequency of heterozygous individuals in a population?

• p²

• 2pq

• q²

• p

• q

(GAAT) (GAAT) (GAAT) (GAAT) is an example of:

• restriction fragments.

• DNA fingerprinting.

• PCR.

• STR.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The total amount of DNA in a cell, which is contained in the cell's nucleus (nuclear DNA) and mitochondria (mtDNA), is called the human:

• genome.

• gene.

• allele.

• RNA.

What material is used to isolate and cut DNA?

• separating enzymes

• restriction enzymes

• PCR

• base pairs

Name a method of separating molecules, such as DNA, based on their size

• electrophoresis

• restriction enzymes

• STR

• PCR

If guanine makes up 19% of the nucleotides in a sample of DNA from an organism, then cytosine would make up _____ percent of the bases.

• 19%

• 62%

• 31%

The process of DNA Fingerprinting is based on the fact that

• everyone has the exact same DNA.

• no 2 people, except identical twins, have exactly the same DNA as someone else.

• most genes are dominant.

• None of the other answer choices are correct.