Every cell contains __________ which contains the code of who you are and the instructions for life.


Question 1 options:


DNA



nucleotide



DNR



cytoplasm


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Question 2 (3 points) Question 2 Saved

A segment of DNA that determines a particular trait is called a __________.


Question 2 options:


helix



chromosome



gene



nucleotide


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Question 3 (3 points) Question 3 Saved

How many pairs of chromosomes does a human have?


Question 3 options:


52



46



23



24


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Question 4 (3 points) Question 4 Unsaved

Having a dimpled cheek is a dominant trait (D) and having a non-dimpled cheek is a recessive trait (d). If someone is homozygous dominant, then what genotype does the person carry?


Question 4 options:


Ddd



dd



Dd



DD


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Question 5 (3 points) Question 5 Saved

The physical trait that an organism expresses is called the _________.


Question 5 options:


heterozygote



homozygote



phenotype



genotype


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Question 6 (3 points) Question 6 Unsaved

T is the allele that represents a thorned plant


t is the allele that represents a non-thorned plant


What is the genotype of a plant that is heterozygous for the thorned trait?


Question 6 options:


TT



tt



TTt



Tt


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Question 7 (3 points) Question 7 Unsaved

R is the allele for red leaves


r is the allele for yellow leaves


If a plant has the genotype Rr, what phenotype does the plant express?


Question 7 options:


Red



Orange



Gold



Yellow


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Question 8 (3 points) Question 8 Saved

What phase of mitosis is shown below where the chromosomes line up in the middle?


mitosis


Question 8 options:


Telophase



Metaphase



Prophase



Anaphase


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Question 9 (3 points) Question 9 Unsaved

Mitosis is a means of a cell undergoing asexual reproduction to produce two new cells.


Question 9 options:

True

False

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Question 10 (3 points) Question 10 Unsaved

Pairs of the same chromosome as found in a karyotype are called homologous chromosomes.


Question 10 options:

True

False

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Question 11 (3 points) Question 11 Unsaved

When DNA tightly coils up, it forms a(an) __________.


Question 11 options:


karyotype



gene



chromosome



allele


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Question 12 (3 points) Question 12 Unsaved

DNA has a structure that resembles a twisted ladder. This structure is called a______________.


Question 12 options:


double spiral



double helix



helical



double ladder


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