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Heredity
N/A
19
Science
7th Grade
01/27/2011

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Cards

Term
Allele
Definition
Information found on DNA
Term
Gene
Definition
A combination of alleles
Term
Genotype
Definition
A sequence of DNA that determines a trait
Term
Phenotype
Definition
the physical trait
Term
Heterozygous
Definition
a dominant and recessive allele
Term
Homozygous
Definition
Two of the same alleles (dom and dom; recess and recess)
Term
Dominant
Definition
describes an allele as being more likely to happen
Term
Recessive
Definition
describes an allele as being less likely to happen
Term
Why do we use Punnett Squares?
Definition
To predict if an offspring will get a certain allele.
Term
What is the purpose of meiosis?
Definition
to make sex cells
Term
How do the number of chromosomes change during mitosis? Why do they need to change at all?
Definition
They get split in half, because each parent passes one allele each to the offspring.
Term
How is meiosis related to heredity?
Definition
Meiosis judges the outcome of heredity
Term
How is codominance and incomplete dominance different from normal inheritence?
Definition
they have more possible outcomes
Term
What are polygenic traits? How are they different from the traits we've been studying?
Definition
They use many genes for an outcome
Term
What are the sex chromosomes in humans? Which sex chromosomes do males have? Females?
Definition
XX= female
XY= male
Term
What are sex linked traits? How do you write alleles for sex linked traits?
Definition
Traits that are found on the X chromosome with the allele as an exponent
Term
Simple Dominance
Definition
one letter only; uses capital and lower case
Term
Incomplete Dominance (blend)
Definition
2 letters; neither letter is dominant; ex. Red= RR White= WW Pink= RW
Term
Sex Linked Traits
Definition
Mom= XX
Dad= XY Traits only on the X
Sex linked traits are recessive
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