BIOD351 EXAMINATION 2026 VERIFIED
ANSWER BLUEPRINT
◉Short hair in rabbits is governed by a dominant gene (l+) and long
hair by its recessive
allele (l). Black hair results from the action of the dominant gene
(b+) and brown hair is from its allele (b). Give the genotypic and the
corresponding phenotypic ratios of the F2 from a cross of a female
rabbit with brown hair and male rabbit with long hair. This assumes
female is homozygous for short hair and male is homozygous for
black hair. Answer: Genotype:
1: l+l+b+b+
2: l+l b+b+
2: l+l+b+b
4: l+l b+b
1: l+l+ bb
2: l+l bb
1: ll b+b+
2: ll b+b
1: llbb
Phenotype:
,Short Black
Short Black
Short Black
Short Black
Short Brown
Short Brown
Long Black
Long Black
Long Brown
◉Stem color of tomato plants is known to be under the genetic
control of at least one pair
of alleles such that A- results in the production of anthocyanin
pigment (purple stem). The recessive genotype aa lacks this pigment
and hence is green. The production of two locules in the tomato fruit
is controlled by the dominant allele M and multiple locules is
determined by mm. Give the genotypic and phenotypic ratios of the
F1
a cross between an inbred tomato plant that has a purple stem and
fruit with two locules crossed to a tomato plant that have fruit with
multiple locules and a green stem. Answer: Genotype: AaMm
Phenotype: Purple & 2 locules
, ◉Stem color of tomato plants is known to be under the genetic
control of at least one pair
of alleles such that A- results in the production of anthocyanin
pigment (purple stem). The recessive genotype aa lacks this pigment
and hence is green. The production of two locules in the tomato fruit
is controlled by the dominant allele M and multiple locules is
determined by mm. Give the genotypic and phenotypic ratios of the
F2 from a cross between an inbred tomato plant that has a purple
stem and fruit with two locules crossed to a tomato plant that have
fruit with multiple locules and a green stem. Answer: 1 AAMM
Purple, 2 locules
2 AaMM Purple, 2 locules
2 AAMm Purple, 2 locules
4 AaMm Purple, 2 locules
1 aaMM Green, 2 locules
2 aaMm Green, 2 locules
1 AAmm Purple, Multi loc
2 AAMm Purple, Multi loc
1 aamm Green, Multi loc
◉What does a diamond symbol Δ in a pedigree indicate? Answer:
Sex Unspecified
◉What is does a vertical pattern of inheritance in a pedigree likely
indicate? Answer: Rare Dominant Trait
ANSWER BLUEPRINT
◉Short hair in rabbits is governed by a dominant gene (l+) and long
hair by its recessive
allele (l). Black hair results from the action of the dominant gene
(b+) and brown hair is from its allele (b). Give the genotypic and the
corresponding phenotypic ratios of the F2 from a cross of a female
rabbit with brown hair and male rabbit with long hair. This assumes
female is homozygous for short hair and male is homozygous for
black hair. Answer: Genotype:
1: l+l+b+b+
2: l+l b+b+
2: l+l+b+b
4: l+l b+b
1: l+l+ bb
2: l+l bb
1: ll b+b+
2: ll b+b
1: llbb
Phenotype:
,Short Black
Short Black
Short Black
Short Black
Short Brown
Short Brown
Long Black
Long Black
Long Brown
◉Stem color of tomato plants is known to be under the genetic
control of at least one pair
of alleles such that A- results in the production of anthocyanin
pigment (purple stem). The recessive genotype aa lacks this pigment
and hence is green. The production of two locules in the tomato fruit
is controlled by the dominant allele M and multiple locules is
determined by mm. Give the genotypic and phenotypic ratios of the
F1
a cross between an inbred tomato plant that has a purple stem and
fruit with two locules crossed to a tomato plant that have fruit with
multiple locules and a green stem. Answer: Genotype: AaMm
Phenotype: Purple & 2 locules
, ◉Stem color of tomato plants is known to be under the genetic
control of at least one pair
of alleles such that A- results in the production of anthocyanin
pigment (purple stem). The recessive genotype aa lacks this pigment
and hence is green. The production of two locules in the tomato fruit
is controlled by the dominant allele M and multiple locules is
determined by mm. Give the genotypic and phenotypic ratios of the
F2 from a cross between an inbred tomato plant that has a purple
stem and fruit with two locules crossed to a tomato plant that have
fruit with multiple locules and a green stem. Answer: 1 AAMM
Purple, 2 locules
2 AaMM Purple, 2 locules
2 AAMm Purple, 2 locules
4 AaMm Purple, 2 locules
1 aaMM Green, 2 locules
2 aaMm Green, 2 locules
1 AAmm Purple, Multi loc
2 AAMm Purple, Multi loc
1 aamm Green, Multi loc
◉What does a diamond symbol Δ in a pedigree indicate? Answer:
Sex Unspecified
◉What is does a vertical pattern of inheritance in a pedigree likely
indicate? Answer: Rare Dominant Trait
