Unit 7 Review

Fruit fly gametes each have 4 chromosomes representing 2 to the 4th power, or 16, possible chromosome combinations. How many chromosome combinations could result from fertilization between a fruit fly egg and a sperm cell.

• 256
• 32
• 128
• 24

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NGSS.HS-LS3-2

NGSS.HS-LS3-3

A student uses string to model four pairs of homologous chromosomes in a parent cell. Each chromosome pair is a different color. Which model would best show the genetic makeup of a daughter cell produced by meiosis? 

• four strings, each a combination of different colors
• two strings, each the same color
• two strings, each a combination of different colors
• four strings, each the same color

Tags

NGSS.HS-LS3-2

Which of the following statements describe differences between mitosis and meiosis? Select all correct answers. 

• Mitosis is involved in asexual reproduction, and meiosis is involved in sexual reproduction
• Only body cells result from mitosis, but both body cells and gametes result from meiosis
• Mitosis produces diploid cells, and meiosis produces haploid cells
• Mitosis produces genetically unique cells, and meiosis produces genetically identical cells.
• Two daughter cells are produced by mitosis, and four daughter cells are produced by meiosis

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NGSS.HS-LS1-4

Which of the following statements best describes how genes relate to traits? 

• Genes code for the production of specific proteins. These proteins lead to different traits.
• Genes and traits function together to produce proteins. 
• Traits contain instructions for making proteins, and genes are the observable outcome of such proteins.
• Genes are expressed according to instructions in traits. 

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

Why did Mendel remove the stamens of some pea plants during his first experiments? Select all correct answers. 

• To prevent reproduction from occurring
• to control which parent plants were allowed to reproduce
• to prevent self-fertilization of the pea plants
• to allow the pea plants to reproduce asexually

Mendel's F1 generation of pea plants were heterozygous. What does this mean? 

• All of the offspring plants would have the recessive trait
• Half of the offspring plants would have the dominant trait, while the other half would have the recessive trait. 
• The offspring had two identical alleles for the same gene
• The plants had two different alleles for the same trait

Which of the following statements best describes why a recessive trait is not observed in the offspring of a cross between a homozygous-dominant and a homozygous-recessive parent?

• The offspring will be heterozygous, and the dominant allele masks the appearance of the recessive allele.
• Recessive alleles are blended with dominant alleles to make an intermediate trait. 
• The offspring will likely be homozygous dominant for this trait and therefore show the dominant trait.
• The dominant alleles will destroy the recesive alleles. 

Tags

NGSS.HS-LS3-1

Which of the following questions can be answered by Mendel's Law of Segregation? 

• Why do the offspring of a plant that is homozygous tall (TT) and homozygous short (tt) all appear tall? 
• In what way do traits pass from one generation to the next? 
• How can a plant that is heterozygous for height (Tt) have both tall and short offspring? 
• Why don't tall pea plants also all have purple flowers?

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The results of a study on the effects of mutagen on bacteria had the following results. Some bacterial cultures were exposed to the mutagen, some were not. Which culture was most likely exposed to the mutagen? 

• 0 bacteria cells
• 350 bacteria cells
• 10 bacteria cells
• 3 bacteria cells
• 4 bacteria cells

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NGSS.HS-LS3-2

Epidermolysis bullosa is a disease characterized by very delicat skin that easily blisters upon scratching or being exposed to the slightest friction. The disease is caused by a missense mutation. Which statement describes the mutation that causes epidermolysis bullosa? 

• The muttaion is a result of the premature completion of a protein.
• The mutation is caused by a change in one of the amino acids.
• This mutation is a result of the reading frame being shifted.
• This mutation is caused by the duplication of the genome. 

Tags

NGSS.HS-LS3-2