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15 Cards in this Set

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Mendel's Principle of Dominance
Principle of Dominance - when 2 forms of same gene are present, the dominant allele is expressed
What is Pleiotropy?
one gene affects more than one phenotype
C_ color
cc no color
In a test cross with what genotype do you cross the unknown:
a. WW
b. Ww
c. ww
c. ww
in order to determine a missing genotype ALWAYS cross with a homozygous recessive
homo
What is Epistatis?? Give an example.
one gene masks the expression of another gene
- 3 phenotypes rather than 4
ex. mammal coat color
polygenetic
What is an example of a phenotype?
a. height
b. Ww
c. chicken comb
d. blue
d. phenotype is how you LOOK
I'm so beautiful I should sing solo.
Affected males (sex-linked) pass the gene to ________ of their daughters and _______ of their sons.
a. all/none
b. none/all
c. all/all
d. none/none
a. because males have only 1 X chromosome they MUST pass it on to all of his daughters, his sons get his y, which is not traced to sex-linked infections.
this question is really easy, think sex chromosomes!!
What are the 3 primary patterns of inheritance?
1) autosomal recessive
2) autosomal dominant
3) sex-linked (X-chromosomal)
a
a
s
_______ allele(s) make up ________ gene(s). (give amount)
2, 1
small numbers
In Dan's family, dumbo ears are dominant. What would be the resulting genotypes and phenotypes of the following cross:
Woman whose ears are heterozygous crossed with a man whose ears are homozygous Dominant
what is the resulting ratio homo:hetero
all dumbo ears
TT, Tt
1homo:1hetero
Tt x TT
Mendel's Principle of Segregation
Principle of Segregation - in meiosis, 2 alleles separate so that each gamete receives only one form of the gene
crossover frequency equation
# if recombinants/total # of offspring x 100
it's a percent
The **farther/less** apart genes are, the **greater/smaller** the probability that crossing over will occur between them
farther/smaller
does it make sense?
Complete linkage is common.
True or False
False, Complete Linkage is RARE
what are recombinants??
offspring that result whose parents' phenotypes are both different and also different from the offspring in question
Mendel's Principle of Independent Assortment
Principle of Independent Assortment - each trait is inherited independent of other traits (chance)