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Chapter 3
mutliple choice
21
Science
7th Grade
12/08/2009

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Term
Gregor Mendel
Definition
Who is known as the father of Genetics
Term
how sex cells form
Definition
Gregor Mendel's work was the foundation for understanding which of these?
Term
tall
Definition
When Mendel crossed purebred tall plants with purebred short plants, all the offspring were
Term
alleles
Definition
The different forms of gene are called
Term
dominant
Definition
An allele whose trait always shows up in an organism when the allele is present is
Term
both A and B TT/Tt
Definition
Which of the following represents the genotype for a tall stem?
Term
round
Definition
If the genotype of pea plant seeds is RR, what is the phenotype?
Term
heterozygous
Definition
An organism that has two different alleles for a trait is called
Term
homozygous
Definition
An organism that has two identical alleles for a trait is called
Term
chromosomes
Definition
Genes are carried from parents to their offspring on which structures?
Term
sex cells
Definition
What is formed during meiosis?
Term
23
Definition
How many pais of chromosomes do human body cells contain?
Term
proteins
Definition
Amino acids are the building blocks of
Term
separated
Definition
During meiosis, the chromosomes pais are
Term
phenotype
Definition
An organisms physical appearance is its
Term
False
Definition
A dominant allele is represented by lowecase letter
Term
True
Definition
Dominant alleles always show up in the organism when the allele is present.
Term
True
Definition
A recessive allele represented by a lowercase letter.
Term
True
Definition
Genes are the factors that control traits.
Term
False
Definition
All mutations are harmful
Term
True
Definition
Sex cells have half the number of chromosomes as the body cells do.
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