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Chapter Nine
notes
29
Biology
9th Grade
02/25/2014

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Term
What is the stud of heredity?
Definition
genetics
Term
What is the passing of traits from parents to offspring?
Definition
heredity
Term
What is the segment of DNA that determines specific traits?
Definition
Gene
Term
What are the two different genes called?
Definition
alleles
Term
How many alleles do each organism have?
Definition
two
Term
Where do organisms get the two alleles they have?
Definition
one from each parent
Term
Who was the Australian monk who studied garden peas and is considered the "father of modern genetics?"
Definition
Gregor Mendel
Term
What is the trait that appears more often and is represented by a capital letter?
Definition
dominant gene
Term
What is the gene that is seldom expressed and is represented by a lowercase letter?
Definition
recessive gene
Term
What is another word for homozygous?
Definition
pure
Term
What are homozygous?
Definition
two alleles for a trait are the same (either both recessive or both dominant)
Term
What is another word for heterozygous?
Definition
hybrid
Term
What is it called when two alleles for the trait are different from each other (one is dominant and one is recessive)
Definition
heterozygous
Term
What is genotype?
Definition
the gene combination present that consists of two letters (one from mother and one from father, TT,tt,Tt)
Term
What is the way an organism looks or behaves?
Definition
phenotype
Term
What is the short hand way of finding the expected proportions of the possible genotypes and was developed by Reginald Punnett in 1905?
Definition
The Punnett Square
Term
What is the parental generation (original parent)?
Definition
P generation
Term
What is the offspring of the P generation?
Definition
F1 Generation
Term
What is it called when alleles separate during the formation of gametes?
Definition
Law of Segregation
Term
What is a cross involving one pair of contrasting traits?
Definition
monohybrid cross
Term
How is the Punnett Square used with Monohybrid Crosses?
Definition
it's used to study the inheritance of one trait
Term
How is the Punnett Square used with Dihybrid Crosses?
Definition
it compares 2 traits
Term
What is a Dihybrid Cross?
Definition
cross in which 2 traits are tracked
Term
What is the Law of Segregation?
Definition
during fertilization, gametes randomly pair to produce four combos of alleles
Term
What is the Law of Independent Assortment?
Definition
states that genes separate independently of one another in meiosis
Term
What is pedigree?
Definition
graphic representation of genetic inheritance
Term
What is the chart showing chromosome pairs arranged according to location and is used to pinpoint unusual chromosome numbers in cells?
Definition
karyotype
Term
XX
Definition
female
Term
XY
Definition
male
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