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6. Heredity

DDMS 7th Grade- Chapter 14; sec. 3-5

The passing of characteristics from parents to offspring Heredity
The scientific study of heredity Genitics
A physical characteristic that an organism can pass to its offspring through genes Trait
An offspring of many different generations that all have the same trait Purebred
The part of our chromosomes that control certain traits Genes
The different forms that a gene may have Allele
An allele whose trait always shows up when it is present Dominant Allele
An allele whose trait may be hidden if a dominant allele is present Recessive Allele
A number that describes how likely it is that an event will occur Probability
A chart that shows all the possible combinations of alleles that can result from a genetic cross Punnett Square
An organisms physical appearance, or visible traits Phenotype
An organisms genetic make-up, or allele combination Genotype
An organism that has two different alleles for a trait Heterozygous
An organism that has two identical alleles for a trait Homozygous
The condition when two different alleles are present, and both traits are shown Codominance
The condition when two different alleles are present, and both traits are blended together Incomplete Dominance
A man is Heterozygous for his brown eyes, and he marries a blue eyed woman. What is the probability of having a brown eyed child? 50%
If Dimples are dominant to No Dimples, what are the possible genotypes for someone with dimples & without dimples? Dimples: DD or Dd No Dimples: dd
Black fur is dominant to brown fur in cats. What are the possibilities when a two heterozygous black cats are crossed? 75 %black 25% brown
Long hair is dominant to short hair in guinea pigs. What is the probability of having a short haired guinea pig when a homozygous long hair and a short hair guinea pig are crossed? 100% long 0% short
If freckles are a dominant trait, is it possible for two parents with freckles to have a child without freckles? Explain. Yes, if both parents are heterozygous, they have a 25% chance of having freckle-less child
If brown hair is dominant to blonde, is it possible for 2 blonde parents to have a brown haired child? Explain No, both parents would have 2 recessive alleles, so the child would have to be blonde.
Created by: jfakins