Please help, I’m having a hard time with this test!

Question 1 (Multiple Choice Worth 2 points)

In humans, hemophilia is a sex-linked recessive trait. If a man and woman have a son with hemophilia, which of the following must be true?

The father has hemophilia.

The mother has hemophilia.

The father carries at least one allele for hemophilia.

The mother carries at least one allele for hemophilia.

Both parents carry at least one allele for hemophilia.

Question 2 (Multiple Choice Worth 2 points)

Biotechnology is currently being used to effectively do which of the following?

Produce vaccines

Produce human gene products

Diagnose diseases

Only Choice 1 and 3 are correct

Choices 1, 2, and 3 are correct

Question 3 (Multiple Choice Worth 2 points)

What two enzymes are needed to produce recombinant DNA?

Polymerase and ligase

Restriction enzyme and ligase

Transcriptase and ligase

Restriction enzyme and reverse transcriptase

Ligase and reverse transcriptase

Question 4 (Multiple Choice Worth 2 points)

The “central dogma” of molecular genetics is that genetic information is coded in self-replicating DNA and undergoes unidirectional transfer to messenger RNAs in transcription which act as templates for protein synthesis in translation. The exception to part of this statement is:

retroviruses

tumor viruses

plasmids

restriction enzymes

gene cloning

Question 5 (Multiple Choice Worth 2 points)

In a Mendelian cross between two pea plants that are heterozygous for flower color, what is the probability that the offspring will inherit at least one dominant allele?

1

3/4

2/3

1/2

1/4

Question 6 (Multiple Choice Worth 2 points)

A couple has two children who both have blue eyes and blonde hair. Both parents are homozygous for blue eyes (bb), but the mother has brown hair (Hh) and the father is a blonde (hh). What is the probability that their next child will have blue eyes and brown hair?

1

1/2

1/4

1/8

1/16

Question 7 (Multiple Choice Worth 2 points)

Which of the following best describes the parents in a testcross?

Both individuals are heterozygous

Both individuals are homozygous

Both individuals have the recessive phenotype

One individual has the dominant phenotype and the other has the recessive phenotype

Both individuals have an unknown phenotype

Question 8 (Multiple Choice Worth 2 points)

Which of the following is true of the Law of Independent Assortment?

It states that the alleles at different loci separate independently of each other in a monohybrid cross.

It is the reason that the expected ratio in the F2 generation is 9:3:3:1.

It states that individuals have 2 alleles for each gene and gametes end up with only one of the two alleles.

It states that if an organism has two different alleles for a gene, only one allele has a noticeable effect on the organism’s appearance.

More than one of the above answers is correct.

Question 9 (Multiple Choice Worth 2 points)

A pair of homologous chromosomes

often have different lengths

often have different alleles

often have different genes for different traits

are separated into different daughter cells during the process of mitosis

would have both been inherited only from the mother or only from the father

Question 10 (Multiple Choice Worth 2 points)

Polygenic inheritance is best represented by which of the following?

Skin pigmentation in humans

ABO blood group in humans

White and purple flower color in pea plants

Colorblindness in humans

Pink petal color in snapdragons

Question 11 (Multiple Choice Worth 2 points)

In human blood groups, Rh positive is dominant over Rh negative. A woman with A positive blood has a son who is B negative and a daughter who is O positive. Which of the following represents a possible genotype for the mother?

IAi rr

IAi RR

IAIA RR

IAIA Rr

IAi Rr

Question 12 (Multiple Choice Worth 2 points)

Based on the data in the chart below, answer the question that follows. Assume that the wild type parental fly (gray body/normal wings) is heterozygous for the traits, and that the recessive parental fly (ebony body/vestigial wings) is homozygous recessive for the traits. A total of 2000 flies were counted.

What could be concluded about these genes?

They are sex-linked, and affect only males.

They are autosomal on separate chromosomes.

They are autosomal but at opposite ends of the same chromosome.

They are not affected by crossover events.

They are linked on the same chromosome and experienced a crossover event.

Question 13 (Multiple Choice Worth 2 points)

A student performed a bacterial transformation experiment, and introduced a plasmid into an E.coli suspension that contained a resistance gene to the antibiotic, erythromycin. The student plated the tra

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