Punnett Squares and Pedigrees

The gene for black fur in guinea pigs is dominant over the gene for white fur. What is the percent chance of having an offspring with white fur in a cross between a black guinea pig and a white guinea pig (Bb x bb)?

• 25%

• 50%

• 75%

• 100%

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NGSS.HS-LS3-1

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What is true about a dominant trait?

• It is expressed in the phenotype.

• It is represented by a lowercase letter.

• It is only visible if two alleles for the trait are present.

• It is not visible in a person who is heterozygous.

What does it mean if a trait is dominant?

• If the trait is present, then the trait is always expressed.

• If the trait is present, then the trait is never expressed.

• If the trait is absent, then the organism will not survive.

• If the trait is absent, then the organism will survive.

Tags

NGSS.HS-LS3-1

Examine the Punnett square. When the Punnett square is complete, what will the data in the four individual squares represent?

• most likely phenotypes in the offspring

• possible allele pairs in the offspring

• traits that will be inherited by four different offspring

• traits that are a result of random mutations in the offspring

Tags

NGSS.HS-LS3-1

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The table provides information about two inherited traits in plants, stem height, and flower color. Which genotype represents a plant with short stems?

• Tt

• tt

• TT

• Tr

Tags

NGSS.HS-LS3-1

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?

• Punnett square A

• Punnett square B

• Punnett square C

• Punnett square D

Tags

NGSS.HS-LS3-3

The diagram shows the inheritance of a recessive disorder. Which statement describes the ability of the children passing a recessive gene to their offspring?

• One child can pass the recessive gene to their offspring, and three children cannot.

• Two children can pass the recessive gene to their offspring, and two children cannot.

• Three children can pass the recessive gene to their offspring, and one child cannot.

• Four children can pass the recessive gene to their offspring, and zero children cannot.

Tags

NGSS.HS-LS3-1

Examine the scenario to answer the question. Tay-Sachs disease is an inherited disorder that affects young children by causing a breakdown of nerve cells in the brain and spinal cord. This breakdown causes a child to show weakened mental and physical abilities, which leads to a loss of motor skills, mental functions, and death. A couple analyzes their family histories of Tay-Sachs disease, and both find that both of their parents had a sibling who died from the disease. Due to the presence of the disease in both of their families histories, the couple visits a genetic counselor before having a child. The genetic counselor analyzes the genetic code of the couple to determine the likelihood that they will pass the gene for Tay-Sachs disease to their child. After analyzing the genetic code of the couple, the genetic counselor shares that neither person exhibits the disease, but each has the genetic markers for Tay-Sachs disease in their DNA. What is the percent probability that a child of the couple will exhibit Tay-Sachs disease?

• 0%

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-3

In pea plants, the trait for green pods (G) is dominant over the trait for yellow pods (g). The Punnett squares show crosses a gardener makes between two pea plants. Which cross will produce more pea plants that have genotypes most similar to the parents' genotypes?

• Cross 1; the gardener will obtain pea plants with the genotype gg only.

• Cross 2; the gardener will obtain pea plants with the genotype Gg only.

• Cross 1; the gardener will obtain pea plants with the genotypes Gg and gg.

• Cross 2; the gardener will obtain pea plants with the genotypes Gg and gg.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A researcher collects genetic information about three generations of a family with a history of Huntington's disease. 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

NGSS.HS-LS3-2

NGSS.HS-LS3-3