Week 9 Test Answers

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Red-green color blindness is an X-linked recessive disorder. What is the probability of the offspring having red-green color blindness for the cross that is represented by the Punnett square?

0 percent

25 percent

50 percent

75 percent

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Hemophilia is an X-linked recessive disorder that is passed through generations and can be traced by using a pedigree. Who has hemophilia in the pedigree that is shown?

John and Ann

Fred and Luke

John, Charles, Jack, and Irene

Ann and Marie

Photo 51 is a picture of the structure of DNA that was used to create a model of DNA. Who created the photo?

James Watson and Francis Crick

Erwin Chargaff

Rosalind Franklin

Friedrich Miescher

A Venn diagram can be used to compare and contrast nucleic acids.Which characteristic would be correctly found in B?

contain ribose

consist of two strands

made of nucleotides

have an R group

Round seeds and yellow seed color are dominant to wrinkled seeds and green seed color. Which Punnett square represents the correct way to set up the cross RRYy ´ RrYY?

A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R y, r Upper Y, r y. The rows are labeled Upper R Upper Y, Upper R y, r Upper y, r y.

A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R y, r Upper Y, r y. The rows are labeled Upper R Upper Y, Upper R y, Upper R Upper y, Upper R y.

A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R Upper Y, r Upper Y, r Upper Y. The rows are labeled Upper R Upper Y, Upper R y, Upper R Upper Y, Upper R y.

A 4-column Punnett square has 4 rows. The columns are labeled Upper R Upper Y, Upper R Upper Y, r Upper Y, r Upper Y. The rows are labeled Upper R Upper Y, Upper R Upper Y, Upper R Upper Y, Upper R Upper y.

A strand of DNA contains the bases adenine, cytosine, cytosine, and guanine, in that order. Which would be the order of the bases on the opposite strand of DNA?

cytosine, adenine, adenine, and thymine

cytosine, thymine, thymine, and adenine

thymine, guanine, guanine, and cytosine

thymine, adenine, adenine, and cytosine

Where does a peptide bond form?

between the five-carbon sugar of one nucleotide and the phosphate group of another nucleotide

between the R group of one amino acid and the carboxyl group of another amino acid

between the amino group of one amino acid and the carboxyl group of another amino acid

between the nitrogenous base of one nucleotide and the phosphate group of another nucleotide

Which best describes a codon?

a cell structure that gives the master instructions for an organism

a segment of DNA that is the basis of heredity in organisms

the sequence of three bases that codes for a specific amino acid

the basic unit of structure and function of all living things

Pedigrees help geneticists understand how traits are inherited between generations. Red-green color blindness is a sex-linked disorder that is determined by a recessive allele on the X chromosome.If Brian has a son who is color-blind, what is known about the genotype of the son's mother?

She must have at least one allele for color blindness.

She must have two alleles for color blindness.

She cannot be homozygous recessive for the gene for color blindness.

She cannot be a heterozygous carrier of the gene for color blindness.

What scientific knowledge about macromolecules is a direct result of Gerardus Johnannes Mulder’s 1838 discovery?

All proteins contain carbon, hydrogen, oxygen, and nitrogen.

All carbohydrates contain carbon, hydrogen, and oxygen.

Nucleic acids are polymers with nucleotide monomers.

The helical structure of DNA is essential for protein production.

The pedigree traces red-green color blindness. Which family members have red-green color blindness?

Sam, Tim, Bella, and Joshua

Lisa and Monica

Ben, Jenny, Mike, Carol, Katie, and Chris

Sam, Joshua, and Tim

Which represents the cross between parent plants if one is heterozygous and has yellow-colored pods and the other is homozygous and has green-colored pods?

Yy ´ yy

YY ´ yy

Yy ´ Yy

yy ´ yy

In roses, red flowers and long stems are dominant traits. A rose plant that is homozygous for both red flowers and long stems is crossed with a rose plant that is heterozygous for red flowers and homozygous for short stems. What percentage of the offspring will exhibit red, long-stemmed flowers?

25 percent

50 percent

75 percent

100 percent

Which flow chart correctly organizes the structures of heredity, from least to most complex?

codon ® gene ® DNA ® chromosome

gene ® chromosome ® codon ® DNA

DNA ® codon ® chromosome ® gene

chromosome ® DNA ® gene ® codon

The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, Upper D d, Upper D d, Upper D d.

A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled d and d. Clockwise from upper left the boxes contain: Upper D d, d d, d d, Upper D d.

A Punnett square is shown. The columns are labeled Upper D and d. The rows are labeled Upper D and d. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D d, d d, UpperD d.

A Punnett square is shown. The columns are labeled Upper D and Upper D. The rows are labeled Upper D and Upper D. Clockwise from upper left the boxes contain: Upper D Upper D, Upper D Upper D, Upper D Upper D, Upper D Upper D.

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