Bi-Weekly

A researcher collects genetic information about three generations of a family with a history of Huntington’s disease. The researcher presents the information in the table.

The researcher concludes that Huntington’s disease is caused by a dominant trait. Which statement supports this conclusion?

• The number of affected females is greater than the number of affected males.

• The number of carrier males and females is zero.

• The number of carrier females is greater than the number of affected males.

• The number of unaffected females is equal to the number of unaffected males.

Tags

NGSS.HS-LS3-1

The Thad Cochran National Warmwater Aquaculture Center researches catfish and salmon to find ways to reduce fish disease and speed up growth for farmed fish. What is one argument against their research?

• If fish do not get any diseases, they will overpopulate the rivers and oceans, causing the food chain to be disrupted.

• Selective breeding can create a new species of fish, and those genes could be passed to humans through ingestion.

• When fish escape into the wild, they can breed with native catfish or compete with them for food, causing environmental problems.

• Changing the genes of the fish will alter their ability to defend themselves in the wild, which will cause their predators to overpopulate.

The table gives information about qualities observed in cows that are selectively bred.

Which statement provides a logical argument that supports selective breeding?

• Selective breeding increases the risk of birth defects in cows.

• Selective breeding produces cows that are more susceptible to disease.

• Selective breeding increases milk and meat yields.

• Selective breeding results in more fertile cows that produce more offspring.

Tags

NGSS.MS-LS4-4

• A

• B

• C

• D

Examine the Punnett square showing the inheritance of flower color in plants.

If (R) represents the dominant color red, and (r) represents the recessive color white, what is the possibility that the two plants will have white offspring?

• 0%

• 50%

• 75%

• 100%

In chickens, the trait for yellow legs (Y) is dominant over the trait for white legs (y). A breeder wants to cross his chickens to have offspring with an equal ratio of chicks with yellow and white legs. Which Punnett square best represents the outcome that the breeder desires?

• 
• 
• 
• 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A mother has curly hair while a father has straight hair. Three of their four children have curly hair while one child has straight hair.

Which statement best explains the reason that three children have curly hair, and only one child has straight hair?

• Three of the four children received the genes for hair texture only from their mother, and the gene for curly hair must be a dominant trait.

• All four children received the genes for hair texture from both parents, but the gene for curly hair may be a dominant trait.

• All four children received the genes for hair texture from both parents, but the gene for curly hair must be a recessive trait.

• One of the four children received the genes for hair texture only from their father, and the gene for curly hair may be a recessive trait.

Tags

NGSS.MS-LS3-2

NGSS.MS-LS4-4

In chickens, rose comb is dominant over single comb. If a homozygous rose comb male is crossed with a heterozygous female, what percentage of the offspring would likely have a rose comb?

• 0%

• 25%

• 75%

• 100%

The genotype for a specific trait is written with two letters such as BB, Bb, or bb, and a cross for a trait can be written BB x Bb. What do the two letters of the genotype represent?

• An organism's outward appearance is its phenotype.

• An organism's genotype is a result of its phenotype.

• Genes for a trait come from either the mother or father but not both parents.

• Traits are passed from both parents to offspring through pairs of genes.

A student studies the diagram shown.

What can be concluded about the relationship between genes, chromosomes, and inherited traits?

• An organism obtains one allele for a gene of a specific trait from each parent on one chromosome.

• An organism obtains two alleles for a gene of a specific trait from each parent on one chromosome

• An organism obtains two alleles for a gene of a specific trait from each parent on two chromosomes.

• An organism obtains one allele for a gene of a specific trait from one parent on one chromosome.

Tags

NGSS.MS-LS3-2