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Bio 30 Genetics and Inheritance Questions and
Verified Answers
What is selective breeding?
Ans: Living organisms with desired traits are bread to produce the traits in
offspring
list the 4 early theories of inheritance
Ans: 1. aristotle's theory called pangenesis.
egg+sperm consist of pangenes which develop into the parts of the body
thier from after fertilization
2. anthony leeuwenhoek disovered living sperm in a microscope and thought
he saw a mini person called homunculus in the sperms head. which then
develops in the mother
3. regnier de graff proposed the egg had the mini person not sperm.
4. in 1800s the idea of traits being always blended from the both parents
came forth.
Dominant vs. Recessive Alleles
Ans: -A dominant allele is always expressed, even if only one copy is present
-A recessive allele is only expresses if two copies are present (therefore no
dominant allele present)
What is Mendel's Law of Segregation and what is the ratio?
watch a vid?
, Page | 2
Ans: Alleles pairs separate randomly during gamete formation, and reunite
randomly at fertilization
3:1 ratio
what is a gene, an allele, a phenotype, and a genotype
*R- round seeds
r- wrinkled
Ans: gene- ex: seed shape, eye colour.
allele- forms of a gene, ex for seed shape: round seeds, and wrinkled seeds
are the alleles
genotype- the combination of alleles for any gene/triat. ex: RR, Rr, rr
phenotype- the physical form of the train u observe. ex: for RR and Rr-
round seeds, rr- wrinkled seeds
when is a test cross used and what is a test cross
Ans: used when geneticists want to know if a phenotypically dominant
indivdual (person who express a dominant trait phyically) is homozygous or
hetrozygous dominant (RR or Rr).
a test cross is a cross between the organism of unknown genotype and a
homozygous recessive organism. u use a punnet square. pg 591
Mendel's Law of Independent Assortment and what is the ratio
watch a video?
Ans: the two alleles for one gene segreagate (assort) inpendently of the
alleles for other genes during gamate formation.
9:3:3:1
Bio 30 Genetics and Inheritance Questions and
Verified Answers
What is selective breeding?
Ans: Living organisms with desired traits are bread to produce the traits in
offspring
list the 4 early theories of inheritance
Ans: 1. aristotle's theory called pangenesis.
egg+sperm consist of pangenes which develop into the parts of the body
thier from after fertilization
2. anthony leeuwenhoek disovered living sperm in a microscope and thought
he saw a mini person called homunculus in the sperms head. which then
develops in the mother
3. regnier de graff proposed the egg had the mini person not sperm.
4. in 1800s the idea of traits being always blended from the both parents
came forth.
Dominant vs. Recessive Alleles
Ans: -A dominant allele is always expressed, even if only one copy is present
-A recessive allele is only expresses if two copies are present (therefore no
dominant allele present)
What is Mendel's Law of Segregation and what is the ratio?
watch a vid?
, Page | 2
Ans: Alleles pairs separate randomly during gamete formation, and reunite
randomly at fertilization
3:1 ratio
what is a gene, an allele, a phenotype, and a genotype
*R- round seeds
r- wrinkled
Ans: gene- ex: seed shape, eye colour.
allele- forms of a gene, ex for seed shape: round seeds, and wrinkled seeds
are the alleles
genotype- the combination of alleles for any gene/triat. ex: RR, Rr, rr
phenotype- the physical form of the train u observe. ex: for RR and Rr-
round seeds, rr- wrinkled seeds
when is a test cross used and what is a test cross
Ans: used when geneticists want to know if a phenotypically dominant
indivdual (person who express a dominant trait phyically) is homozygous or
hetrozygous dominant (RR or Rr).
a test cross is a cross between the organism of unknown genotype and a
homozygous recessive organism. u use a punnet square. pg 591
Mendel's Law of Independent Assortment and what is the ratio
watch a video?
Ans: the two alleles for one gene segreagate (assort) inpendently of the
alleles for other genes during gamate formation.
9:3:3:1
