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B6: Quiz 5 – Answers
B6: Quiz 5 – Answers
1)
a) A gene is a code for a particular characteristic
b)
i) Alleles
ii) Dominant
c)
i) We inherit two of every gene; one from our mother and the other from our farther
ii) Both of the genes that we inherit are the same
iii) The genes that we inherit are different
d)
i) Genotype is the genes/ alleles that an organism has for a particular characteristic
ii) Phenotype is the physical characteristic that the organism displays
2) a single gene, many genes
Some characteristics in organisms are determined by A SINGLE GENE. However, the majority of characteristics in organisms are determined by MANY GENES.
3)
a)
i) Homozygous dominant (make sure that you included dominant in your answer)
ii) Tall
b)
i) Heterozygous
ii) Tall
c)
i) Homozygous recessive (make sure that you included recessive in your answer)
ii) Small
d)
i)
a) A gene is a code for a particular characteristic
b)
i) Alleles
ii) Dominant
c)
i) We inherit two of every gene; one from our mother and the other from our farther
ii) Both of the genes that we inherit are the same
iii) The genes that we inherit are different
d)
i) Genotype is the genes/ alleles that an organism has for a particular characteristic
ii) Phenotype is the physical characteristic that the organism displays
2) a single gene, many genes
Some characteristics in organisms are determined by A SINGLE GENE. However, the majority of characteristics in organisms are determined by MANY GENES.
3)
a)
i) Homozygous dominant (make sure that you included dominant in your answer)
ii) Tall
b)
i) Heterozygous
ii) Tall
c)
i) Homozygous recessive (make sure that you included recessive in your answer)
ii) Small
d)
i)
ii) 4
iii) 0
e)
i)
iii) 0
e)
i)
ii) 3 : 1
4)
a)
i)
4)
a)
i)
ii) 100%
b)
i)
b)
i)
ii) 1 : 1 (or 2 : 2)
5)
a) 100%
Both of the diagrams are shown below.
5)
a) 100%
Both of the diagrams are shown below.
b) We can breed the particular brown carp with a blue carp (which will have the genotype bb; homozygous recessive). If any of the offspring are blue, it tells us that the particular brown carp is heterozygous (Bb). If none of the offspring are blue, it tells us that the particular brown carp is homozygous dominant (BB).
Questions
1)
a) Give a definition for a gene
b)
i) What are different versions of the same gene called beginning with the letter a?
ii) There are two names for the different versions of a gene. One is recessive. What is the other one?
c)
i) How many versions of each gene do we inherit and where do we inherit them from?
ii) What does homozygous mean?
iii) What does heterozygous mean?
d)
i) What does genotype mean?
ii) What does phenotype mean?
2) Fill in the gaps in the paragraph below with the words “a single gene” and “many genes”.
Some characteristics in organisms are determined by __________. However, the majority of characteristics in organisms are determined by __________.
3) The height of a pea plant is determined by a single gene. There are two options for height; tall or small. The tall allele for height is dominant, and I will denote it as T. The small allele is recessive, and I will denote it as t.
a) A pea plant has the genotype of TT.
i) What is the name for this genotype?
ii) What will the phenotype be for this plant?
b) A pea plant has the genotype of Tt.
i) What is the name for this genotype?
ii) What will the phenotype be for this plant?
c) A pea plant has the genotype of tt.
i) What is the name for this genotype?
ii) What will the phenotype be for this plant?
d) A pea plant with a genotype of TT is cross bred with a pea plant with a genotype of tt.
i) Fill in the Punnett square below to show the possible genetic outcomes for the offspring.
1)
a) Give a definition for a gene
b)
i) What are different versions of the same gene called beginning with the letter a?
ii) There are two names for the different versions of a gene. One is recessive. What is the other one?
c)
i) How many versions of each gene do we inherit and where do we inherit them from?
ii) What does homozygous mean?
iii) What does heterozygous mean?
d)
i) What does genotype mean?
ii) What does phenotype mean?
2) Fill in the gaps in the paragraph below with the words “a single gene” and “many genes”.
Some characteristics in organisms are determined by __________. However, the majority of characteristics in organisms are determined by __________.
3) The height of a pea plant is determined by a single gene. There are two options for height; tall or small. The tall allele for height is dominant, and I will denote it as T. The small allele is recessive, and I will denote it as t.
a) A pea plant has the genotype of TT.
i) What is the name for this genotype?
ii) What will the phenotype be for this plant?
b) A pea plant has the genotype of Tt.
i) What is the name for this genotype?
ii) What will the phenotype be for this plant?
c) A pea plant has the genotype of tt.
i) What is the name for this genotype?
ii) What will the phenotype be for this plant?
d) A pea plant with a genotype of TT is cross bred with a pea plant with a genotype of tt.
i) Fill in the Punnett square below to show the possible genetic outcomes for the offspring.
ii) How many of the pea plants will be tall?
iii) How many of the pea plants will be small?
e) Two heterozygous pea plants are cross bred.
i) Fill in the Punnett square below to show the possible genetic outcomes for the offspring.
iii) How many of the pea plants will be small?
e) Two heterozygous pea plants are cross bred.
i) Fill in the Punnett square below to show the possible genetic outcomes for the offspring.
ii) Give the ratio of the number of tall to short pea plants.
4) The fur colour for mice is determined by a single gene. The allele for grey fur is dominant, and I will represent it as G. The allele for white fur is recessive, and I will represent it as g.
a) A homozygous dominant mouse breeds with a homozygous recessive mouse.
i) Complete the genetic diagram below to show the possible genetic outcomes for the offspring.
4) The fur colour for mice is determined by a single gene. The allele for grey fur is dominant, and I will represent it as G. The allele for white fur is recessive, and I will represent it as g.
a) A homozygous dominant mouse breeds with a homozygous recessive mouse.
i) Complete the genetic diagram below to show the possible genetic outcomes for the offspring.
ii) What percentage of the offspring will be grey?
b) A heterozygous mouse and a homozygous recessive mouse breed.
i) Complete the genetic diagram below to show the possible genetic outcomes for the offspring. Put the heterozygous mouse on the left and the homozygous recessive mouse on the right.
b) A heterozygous mouse and a homozygous recessive mouse breed.
i) Complete the genetic diagram below to show the possible genetic outcomes for the offspring. Put the heterozygous mouse on the left and the homozygous recessive mouse on the right.
ii) Give the ratio of the offspring that have grey fur to the offspring that have white fur.
5) Carp can be either blue or brown. The colour of carp is determined by a single gene. Brown is the dominant allele, and I will denote it as B. Blue is the recessive allele, and I will denote it as b.
a) I breed a homozygous dominant carp with a homozygous recessive carp. By drawing a genetic diagram of your choice, calculate the percentage of the offspring that will be brown?
b) Discuss how I can find out whether a particular brown carp is homozygous dominant (BB) or heterozygous (Bb).
5) Carp can be either blue or brown. The colour of carp is determined by a single gene. Brown is the dominant allele, and I will denote it as B. Blue is the recessive allele, and I will denote it as b.
a) I breed a homozygous dominant carp with a homozygous recessive carp. By drawing a genetic diagram of your choice, calculate the percentage of the offspring that will be brown?
b) Discuss how I can find out whether a particular brown carp is homozygous dominant (BB) or heterozygous (Bb).