bio 1201 exam 4 pomarico UPDATED
ACTUAL Questions and CORRECT
Answers
who is Gregor Mendel? - CORRECT ANSWER - the father of genetics
what do homologous chromosomes do? - CORRECT ANSWER - carry the same kinds of
genes for the same characteristics
where are the genes for the same characteristic found? - CORRECT ANSWER - at the
same loci on both homologous chromosomes
true or false: genes for a characteristic found on homologous chromosomes are always identical -
CORRECT ANSWER - false
what are alleles? - CORRECT ANSWER - alternative versions of genes found at the same
gene locus
how are alleles formed? - CORRECT ANSWER - by mutations
what happens if a mutation occurs in gametes? - CORRECT ANSWER - the mutation can
be passed on from parent to offspring
true or false: an organism's 2 alleles are always the same - CORRECT ANSWER - false
what makes a specific locus homozygous? - CORRECT ANSWER - if both homologous
chromosomes carry the same allele at a given gene locus (also called true-breeding)
, what makes a specific locus heterozygous? - CORRECT ANSWER - if 2 homologous
chromosomes carry different alleles at a given gene locus (also called hybrid)
what is the punnett square method? - CORRECT ANSWER - a prediction of the possible
offspring genotypes and phenotypes from combinations of parental gametes
how do you make a punnett square? - CORRECT ANSWER - 1) assign letter to the
differet alleles of the characteristic under consideration (uppercase for dominant and lowercase
for recessive)
2) determine the possible gametes from both parents
3) write the gametes from each parent, along each side of a 2 x 2 grid
4) fill in the gentotypes of each pair of combined gametes in the grid
5) determine the genotypic ration based on the outcome of the punnett square
6) based on which traits are dominant and which are recessive, calculate the predicted
phenotypic ratio
what type of organism did mendel use for his experiment? - CORRECT ANSWER - pea
plants
when an organism is homozygous for a particular characteristic, what type of phenotype do they
produce? - CORRECT ANSWER - the same phenotype (if a plant is homozygous for
purple flowers, it will always produce offspring with purple flowers)
what does the term "true-breeding" mean? - CORRECT ANSWER - organisms that are
homozygous for a characteristic
what does the term "genetic crossing" mean in reference to pea plants? - CORRECT
ANSWER - the mating of pollen and eggs from the same or different parents
what happens when you cross a true-breeding purple flower plant with a true-breeding white-
flower plant (P generation)? - CORRECT ANSWER - the F1 generation is composed of all
purple-flowered plants
ACTUAL Questions and CORRECT
Answers
who is Gregor Mendel? - CORRECT ANSWER - the father of genetics
what do homologous chromosomes do? - CORRECT ANSWER - carry the same kinds of
genes for the same characteristics
where are the genes for the same characteristic found? - CORRECT ANSWER - at the
same loci on both homologous chromosomes
true or false: genes for a characteristic found on homologous chromosomes are always identical -
CORRECT ANSWER - false
what are alleles? - CORRECT ANSWER - alternative versions of genes found at the same
gene locus
how are alleles formed? - CORRECT ANSWER - by mutations
what happens if a mutation occurs in gametes? - CORRECT ANSWER - the mutation can
be passed on from parent to offspring
true or false: an organism's 2 alleles are always the same - CORRECT ANSWER - false
what makes a specific locus homozygous? - CORRECT ANSWER - if both homologous
chromosomes carry the same allele at a given gene locus (also called true-breeding)
, what makes a specific locus heterozygous? - CORRECT ANSWER - if 2 homologous
chromosomes carry different alleles at a given gene locus (also called hybrid)
what is the punnett square method? - CORRECT ANSWER - a prediction of the possible
offspring genotypes and phenotypes from combinations of parental gametes
how do you make a punnett square? - CORRECT ANSWER - 1) assign letter to the
differet alleles of the characteristic under consideration (uppercase for dominant and lowercase
for recessive)
2) determine the possible gametes from both parents
3) write the gametes from each parent, along each side of a 2 x 2 grid
4) fill in the gentotypes of each pair of combined gametes in the grid
5) determine the genotypic ration based on the outcome of the punnett square
6) based on which traits are dominant and which are recessive, calculate the predicted
phenotypic ratio
what type of organism did mendel use for his experiment? - CORRECT ANSWER - pea
plants
when an organism is homozygous for a particular characteristic, what type of phenotype do they
produce? - CORRECT ANSWER - the same phenotype (if a plant is homozygous for
purple flowers, it will always produce offspring with purple flowers)
what does the term "true-breeding" mean? - CORRECT ANSWER - organisms that are
homozygous for a characteristic
what does the term "genetic crossing" mean in reference to pea plants? - CORRECT
ANSWER - the mating of pollen and eggs from the same or different parents
what happens when you cross a true-breeding purple flower plant with a true-breeding white-
flower plant (P generation)? - CORRECT ANSWER - the F1 generation is composed of all
purple-flowered plants
