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Life Biology chapter 12 part
Chapter 12 notes from biology 101 using book LIFE
What are the two assumptions on inheritance?
1 Each parent contributes equally to offspring which is correct 2 blending inheritance hereditary determinants blend in the offspring not correct
Who was the fater of fenetics?
Observable physical feature
Form of a character
What is heritable trait?
Passed from parent to offspring
What is true breeding?
Parents with same trait produce only that trait in offspring
What did mendel use to test for characters?
Parental generation is what?
P, and true breeding. Pollen from one parent was transferred to the stigma of the other parent
First Filial Generation is what?
F1 Hybrids Resulting offspring from cross of P
What is second Filial generation?
F2 Resulting offspring if F1 plants self pollinate.
What si a hybrids?
Offspring of crosses of plants with different traits.
What is a monohybrid?
F1 self pollinates to form F2 generation
What is dominant?
Only 1 of 2 parents traits appeared in F1 generation
What is Recessive?
2nd parent trait disappeared in F1 and reappeared in F2
What is reciprocal crosses? Male and female contributes equally to offspring.
Why isn't blending inheritance supported by Mendels crosses?
Recessive traits reappears in F2
Heritable units are discrete particles
What is locus?
The genes site on chromosome
What is a allele?
One or more forms of a gene or genetic locus.
Each plant has ___ for each character, one from each parent.
Particles retain intefrity in presence of other particles does blending occur?
Presence of a particle doesn't ensure its expression why?
Recessives aren't always expressed
What is 2 copies of the same allele?
Homozygous, dominant SS recessive ss always same letter as dominant just written lowercase.
What is heterozygous?
2 differtn alleles dominant is expressed as Ss
What is a heterozygote is what?
A heterozygote individual
Phenotypes are what?
Physical appearance of an organism
Genotypes are what?
The genetic makeup
give an example of a phenotype:
A phenotype can result from 2 different genotypes ie spherical seeds from either SS or Ss