Unit 3 Test Review

If an individual has two alleles that are the same for a particular gene, they are considered:

• Heterozygous

• Homozygous

• Dominant

• Recessive

Which type of inheritance pattern results in both alleles being fully expressed in the phenotype?

• Codominance

• Incomplete dominance

• Simple dominance

• Polygenic inheritance

In a dihybrid cross, what is the phenotypic ratio expected when both parents are heterozygous for two traits?

• 3:1

• 9:3:3:1

• 1:2:1

• 6:3:3:1

Which of the following statements about ABO blood type inheritance is correct?

• Blood type is determined by a single gene with two alleles: A and B.

• A person with blood type O has two recessive alleles (ii) and produces both A and B antigens.

• A person with blood type AB inherits one A allele and one B allele, and expresses codominance, producing both A and B antigens.

• A person with blood type B can only have parents with blood type B or O.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In snapdragons, what does it mean if a trait is incompletely dominant?

• The dominant trait completely masks the recessive trait

• The recessive trait completely masks the dominant trait

• The traits blend to form an intermediate phenotype

• The traits do not affect each other

In fruit flies, what does it mean if a gene is X-linked?

• The gene is located on the Y chromosome

• The gene is located on the X chromosome

• The gene is located on an autosome

• The gene is located on both X and Y chromosomes

In a genetic cross, what does the term "phenotype" refer to?

• The genetic makeup of an organism

• The physical appearance of an organism

• The number of chromosomes in an organism

• The lifespan of an organism

What is the expected genotypic ratio when two homozygous recessive plants are crossed?

• 1:1

• 3:1

• 2:1

• 1:0

Which of the following are CORRECT observations about the differences between MITOSIS and MEIOSIS? (Check all that apply.)

• Mitosis produces cells that identical to the parent cell.

• Meiosis produces cells that have half the number of chromosomes as the parent cell.

• All cells go through INTERPHASE as part of the cell cycle, whether it goes to mitosis or meiosis next.

• In both types of cell division, the chromosomes are only duplicated once.

• Only in Mitosis, do you see chromosomes pair up to form a tetrad.

Tags

NGSS.HS-LS1-4

How many generations are shown in the pedigree?

• 1

• 2

• 3

• 4