Genetic Inheritance: Understanding the Basics

Running head: GENETIC INHERITANCE
GENETIC INHERITANCE
Name of Student:
Name of University:
Author’s Note:

GENETIC INHERITANCE
1
Activity 1
Height (m) Number of people
1.00-1.04 2
1.05-1.09 5
1.10-1.14 9
1.15-1.19 6
1.20-1.24 3
1.25-1.29 1

GENETIC INHERITANCE
2
1.00-1.04 1.05-1.09 1.10-1.14 1.15-1.19 1.20-1.24 1.25-1.29
0
1
2
3
4
5
6
7
8
9
10
Number of people
Height in m
number of people
The graph represented show normal distribution because variable of height of person, vary in
equal range having same mean and mode and the graph is belled shaped.
Activity 2.
Mother has curly hair which is homozygous dominant and father has straight hair which
is homozygous recessive.
C is dominant allele and c is recessive allele where C for curly hair and c for straight hair.
CC is homozygous dominant allele and cc is homozygous recessive allele. Therefore, allele of
straight hair male will be cc and curly hair female will be CC.
If curly hair female CC marries straight hair male cc
Parents’ generation CC×cc
Possible gametes: Cc
Parents Alleles?
Mum has curly hair CC

GENETIC INHERITANCE
3
Parents Alleles?
Dad has straight hair and is homozygous
recessive
cc
Punnett square:
Curly Hair Mother’ allele
C C
Straight hair Father’s
allele
c Cc Cc
c Cc Cc
Therefore, all the child in F1 generation will be heterozygous have Cc having curly hair as
dominant allele will mask the expression of recessive allele.
Genotypic ratio- It is the number of times that a genotype of allele appear in next generation.
Phenotypic ratio is the comparative number of offspring showing a combination or single trait.
It can be determined by test cross.
Brown eye color is dominant to blue eyes genes. B allele is denoting brown color and b
allele is denoting blue color.
Female is heterozygous for brown color eyes whose allele will be Bb and male is homozygous
for blue eye color whose allele will be bb.
Parent generation Bb × bb