Genetics Review

What is Genetics?

• the study of heredity or how those traits are inherited

• a cross between plants with different traits like tall and short

• The square used to determine possible genotypes/phenotypes of offspring

• the passing of characteristics from parents to offspring

In dogs, erect ears (E) is dominant over droopy ears (e). What phenotypes would result if two heterozygous dogs have a litter of puppies?

• EE, Ee, Ee, ee

• 75% Erect and 25% droopy

• 50% Erect and 50% droopy

• Ee, Ee

Which of the following is NOT part of Mendel's principles?

• For each gene, an organism receives one allele from each parent. The alleles separate from each other--a process called segregation--when reproductive cells are formed.

• Each trait or gene is inherited independently from other traits

• Genes are made of DNA

• If an organism inherits different alleles for the same trait, one allele may be dominant over the other

Skin tone in humans is controlled by more than one gene. This type of inheritance is _________

• Codominance

• Polysaccharide

• Polygenic

• Multiple alleles

In a dihybrid cross, you are looking at the probability of _____ trait(s)/characteristics being inherited by offspring

• 1

• 2

• 3

• 4

Predict the phenotype ratio in the following dihybrid cross:(BbRr) x (BbRr)

• 4:4:4:4

• 16:0:0:0

• 8:0:8:0

• 9:3:3:1

Blood type includes which of the following types of inheritance? Select ALL that apply

• Incomplete dominance

• Multiple Alleles

• Complete dominance

• Codominance

• Polygenic

What is the chance a man with AB blood type and a woman with AO blood type will have a child with type O blood?

• 75%

• 25%

• 0%

• 100%

Which answer below shows the four types of allele combinations that are produced from a dihybrid cross of two parents who are DdBb?

• DB: Db: dB: db

• DB: db: BB: DD

• DB: BB: DD: bb

• CC: BB: DD: AA

If a person of type B blood receives a blood transfusion from a person with type O blood, what would be the body's response?

• The type O person would have an allergic reaction.

• The type B person would not have a reaction.

• The type B person's macrophages would recognize the antigen.

• The type O person's memory cells will develop immunity.