Question

1) Rabbit’s ears can be either short (dominant) or floppy (recessive). If a population of rabbits in Hardy-Weinberg equilibrium has 250 short eared rabbits and 100 floppy eared rabbits, what is the allele frequency of the “short” allele?

A.0.714

B.0.465

C.0.845

D.0.535

2)You are observing the suit (clubs, diamonds, hearts, or spades) of a randomly drawn card from a deck. What is the degree(s) of freedom if you were to perform the Chi-square test on the expected and observed outcome of the suits of the cards?

A.1

B.0

C. 3

D.4

3)You perform a Chi-square test for gene *X* and find the
*p-value* to be between 0.05 and 0.01. What can you say with
95% certainty about this population?

A.This population is in Hardy-Weinberg equilibrium at the
*X* locus: gene *X* is influenced by at least one
force of evolution.

B.This population is in Hardy-Weinberg equilibrium at the
*X* locus: gene *X* is not influenced by any forces
of evolution.

C.This population is not in Hardy-Weinberg equilibrium at the
*X* locus: gene *X* is influenced by at least one
force of evolution.

D.This population is not in Hardy-Weinberg equilibrium at the
*X* locus: gene *X* is not influenced by any forces
of evolution.

Please do all three questions.

Answer #1

1) Short-ear rabbit( Aa or AA) = 250

Floppy ear rabbit (aa) = 100

Total = 350

Frequency of floppy ear rabbit (aa) = q2 = 100/350 = 0.2857

So, frequency of floppy ear allele = q = sqrt (0.2857) = 0.5345

Since the population is in HWE, so p+q = 1. So,

p= 1-q = 1- 0.5345 = 0.465

So the correct option is B

2) The degree of freedom = variable – 1

Number of variables here = 4

So degree of freedom = 4-1 = 3

The correct option is C.

3) 0.05 < p < 0.01 represents that only 1-5% of the observed genotypic differences are by chance while rest of the differences are due to some evolutionary forces favoring one of the genotypes. Thus, the population is not in Hardy Weinberg equilibrium.

QUESTION 2 Crossing true breeding dark-coated sheep with true
breeding light-coated sheep always results in 100% dark-coated
offspring. You are screening a population of 300 Soay sheep for
coat color, and you count 224 dark sheep and 76 light sheep. What
is the genotype frequency of the homozygous recessive sheep for
TYRP1 gene if the population is in Hardy-Weinberg equilibrium? a.
0.747 b. 0.253 c. 0.864 d. 0.503 1 points
QUESTION 3 In the same population, if it is under...

1.) What gives rise to different variations of traits within a
species?
a.
Different alleles of a gene
b.
Varying distances between genes
c.
Natural selection
D. None of the above
2.) Crossing true breeding dark-coated sheep with true breeding
light-coated sheep always results in 100% dark-coated offspring.
You are screening a population of 300 Soay sheep for coat color,
and you count 224 dark sheep and 76 light sheep. What is the
genotype frequency of the homozygous recessive sheep...

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