KNOW HOW TO IDENTIFY ALL PHASES OF THE CELL CYCLE.E. 1) If corn plant that has y
ID: 262618 • Letter: K
Question
KNOW HOW TO IDENTIFY ALL PHASES OF THE CELL CYCLE.E.
1) If corn plant that has yellow seed is represented by the alleles, yy and another corn plant that has purple seed is represented by the alleles PP which of the two is considered to be dominant?
2) What would be the phenotypic and genotypic ratio in F2 generation of the offspring of two parents? One parent is homozygously dominant for height and the other parent is recessive for height.
3) What would be the phenotypic and genotypic ratio of the offspring resulting from a cross between two parent plants of peas heterozygously dominant for chlorophyll?
4) A parent plant that is homozygously dominant for the trait of blue flower is self-pollinated by you. What will be your expected phenotypic and genotypic ratios of the resulting offspring?
5) If your sister is heterozygouly dominant for blue eye and her husband is homozygously dominant for blue eye, what will be the expected phenotypic ratio of their offspring?
6) Ester is heterozygous dominant for’ A’ blood type and John is AB blood type. What will be the blood types of their children? Give the genotypic and phenotypic ratio.
7) John has blood type ‘O’ and Sarah has blood type AB. What will be the blood type of their children? Give the phenotypic and genotypic ratio of their children.
Explanation / Answer
One parent is homozygously dominant for height (HH)
Another parent is recessive for height (hh)
Punnett square for F1 generation is as follows:
H
H
h
Hh
Hh
h
Hh
Hh
Genotype of F1 generation is Hh and all the offspring are heterozygous dominant for height.
Punett square for F2 generation is as follows”
H
h
H
HH
Hh
h
Hh
hh
Genotype of F2 generation offspring is HH, Hh, and hh. Genotypic ratio is 1:2:1
Phenotype of F2 generation offspring is
HH – homozygously dominant for height
Hh – heterozygous dominant for height
Hh – recessive for height
Phenotypic ratio is 3:1
3. Given,
Both the parents are heterozygously dominant for chlorophyll (Cc)
Punnett square for the cross is as follows:
C
c
C
CC
Cc
c
Cc
cc
Genotype of offspring is CC, Cc, and cc. Genotypic ratio is 1:2:1
Phenotype of offspring is
CC – homozygously dominant for chlorophyll
Cc – heterozygous dominant for chlorophyll
cc – recessive for chlorophyll
Phenotypic ratio is 3:1
4. Given,
Parent plant is homozygous dominant for blue flower trait (BB) and it is self-pollinated. So, a cross is done between BB x BB alleles. The genotype of all the offspring will be BB (genotypic ratio is 1:0) and all the offspring will exhibit blue trait phenotype (phenotypic ratio is 1:0).
5. Given,
Sister is heterozygous dominant for blue eye (Bb) and her husband is homozygous dominant for blue eye (BB).
Punnett square for the cross is as follows:
B
B
B
BB
BB
b
Bb
Bb
Genotype of the offspring is BB and Bb. Genotypic ratio is 2:2 or 1:1
Phenotype of offspring is as follows:
BB - Homozygous dominant for blue eyes
Bb – Heterozygous dominant for blue eyes
Phenotypic ratio of offspring is 4:0 or 1:0
6. Given,
Ester is heterozygous dominant for A blood type (AO) and John is AB blood type.
Punnett square for the cross is as follows:
A
B
A
AA
AB
O
AO
BO
Genotype of the offspring is AA, AB, AO, BO. Genotypic ratio is 1:1:1:1
Phenotype of the offspring is as follows:
AA – Homozygous dominant for A blood type
AB – Blood type AB
AO – Heterozygous dominant for A blood type
BO – Heterozygous dominant for B blood type.
Phenotypic ratio is 1:2:1
7. Given,
John has blood type O (OO) and Sarah has blood type AB.
Punnett square for the cross is as follows:
A
B
O
AO
BO
O
AO
BO
Genotype of the offspring is AO, BO. Genotypic ratio is 2:2 or 1:1
Phenotype of the offspring is as follows:
AO – Heterozygous dominant for blood type A
BO – Heterozygous dominant for blood type B
Phenotypic ratio is 2:2 or 1:1
H
H
h
Hh
Hh
h
Hh
Hh
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