Spring 2023 Unit 4 Heredity

Assume a white cabbage butterfly mates with a yellow cabbage butterfly, and all of the offspring (F1) are heterozygous and white.

Which cross represents the genotypes of the parent generation?

• Aa x aa

• AA x Aa

• AA x aa

• Aa x Aa

Which cross could produce a child with type O blood?

• IAi x IBIB

• IAIA x IBi

• IAIB x ii

• IAi x IBi

Two heterozygous purple-flowering pea plants are crossed. If purple is dominant over white, what are the expected phenotypic results?

• 100% purple.

• 75% purple,

  25% white.

• 50% purple,

  50% white.

• 25% purple,

  75% white.

In pigs, the allele for a wavy, rough coat (R) is dominant to the allele for a soft, fine coat (r). A rough coat male and a soft coat female mate. They produce several litters, 50% are rough coat and 50% are smooth coat. What must be the genotypes of the parents to create this phenotypic ratio?

• Homozygous dominant and homozygous recessive

• Heterozygous and homozygous recessive

• Homozygous dominant and heterozygous

• Both heterozygous

The Punnett square in Figure depicts a type of cross known as a monohybrid cross, and it is similar to crosses performed by Gregor Mendel. Which of the following arguments can NOT be defended using the evidence in this Punnett square?

• The purple phenotype is dominant and the white phenotype is recessive.

• Having purple flowers gives plants an advantage over plants with white flowers, making the purple ones more likely to survive and produce more offspring.

• If one heterozygote was fertilized by another heterozygote, it is likely that 75% of the next generation of plants would have purple flowers.

• Homozygous recessive plants have white flowers.

Students studied Mendel's laws of segregation and independent assortment. They created a Punnett square to show a cross between a homozygous furred mouse (FF) and a homozygous furless mouse (ff). The students then created a Punnett square for a cross between two heterozygous F1 mice. Which of the following questions could be answered using the information from the Punnett squares in Figure 10?

• How many mice will be produced in the F1 generation?

• Will fewer furless mice survive to adulthood than furred mice?

• Can furred mice produce furless mice?

• Are furred mice the best organism to use for this investigation?

Which of the following represents the genotypes of the parents in this dihybrid cross?

• GGYY x GGYY

• GgYy x GgYy

• GgYY x GgYY

• ggYy x ggYy

What will be the phenotypic ratio of offspring in this dihybrid cross?

• 3:1

• 1:2:1

• 1:1:1:1

• 9:3:3:1

The pedigree in Figure follows a recessively inherited trait. Use the pedigree below to answer questions. What is the genotype of individual IV,1?

• AA

• Aa

• aa

• Not enough information

What is the sex of individual IV,1?

• Female

• Male

• Both

• Noth enough information