Unit 3B: Genetics And Heredity Question Preview (ID: 55960)


Test Review Questions For The Unit 3B Life Science Test. TEACHERS: click here for quick copy question ID numbers.

A dog has 39 chromosomes. Which of these statements correctly compares the number of chromosomes in a body cell with that in a sex cell of a dog?
a) The body cell has 39; the sex cell has 3
b) The body cell has 2n; the sex cell has 1n
c) The body cell has 1n; the sex cell has 2n
d) The body cell has 12; the sex cell has 39

True or false: In anaphase, there is the pinching off or cleaving of the cell into two new cells.
a) True
b) False
c)
d)

True or false: In telophase, the chromosomes line up towards the center, or equator of the cell.
a) True
b) False
c)
d)

What did Gregor Mendel contribute to Science?
a) Learned that people love to eat pink pea plants
b) Discovered that there are different colored pea plants
c) Learned that traits can be passed from parents to offspring
d) Learned that carrots taste better

Which of these characteristics cannot be inherited?
a) Temper
b) Color of hair
c) Shape of nose
d) Height

Which of these characteristics can be inherited?
a) Singing ability
b) Acting ability
c) Sports ability
d) Ear shape

Which of these is true about how traits can be expressed?
a) Alleles from heterozygous (two different alleles) chromosomes determine traits.
b) Alleles on homologous (The chromosome pair is the same) chromosomes determine traits.
c) Chromosomes on genes determine traits.
d) Homozygous chromosomes determine genes.

What is a homologous pair?
a) Two different chromosomes
b) Two identical chromosomes
c) Two identical alleles
d) Two different alleles

The green sea turtle is a species of turtles. Which group will the green sea turtle reproduce with?
a) Any turtle species
b) Any reptile
c) Other green sea turtles
d)

True or false: Genes are made up of tightly wound DNA. Chromosomes are made up of one or more genes.
a) True
b) False
c)
d)

True or false: DNA is a double-helix structure found in the nucleus. Chromosomes straighten the DNA so the code can be read by the genes.
a) True
b) False
c)
d)

True or false: Genes are long, tightly wound strands of DNA.
a) True
b) False
c)
d)

True or false: Sex cells have one set of chromosomes.
a) True
b) False
c)
d)

How many chromosomes are in a sex cell?
a) 46 chromosomes
b) 21 chromosomes
c) 23 chromosomes
d) 2 chromosomes

How many chromosomes are in a body cell?
a) 46 chromosomes
b) 21 chromosomes
c) 23 chromosomes
d) 2 chromosomes

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