For the purpose of this problem assume that in humans the gene for curly hair is
ID: 18848 • Letter: F
Question
For the purpose of this problem assume that in humans the gene for curly hair is controlled by a single gene and that the allele for curly hair (C) is dominant to that for straight hair (c).If the first child born to parents who are both heterozygous for type of hair is a boy with straight hair, what is the probability that the second child will be a curly-haired son? (PLEASE NOTE: the chance that an offspring will have a particular gender, male or female, is always ½). (please show all math/work)
Parental genotypes: ___________ x ___________
Punnett square:
Explanation / Answer
For the purpose of this problem assume that in humans the gene for curly hair is controlled by a single gene and that the allele for curly hair (C) is dominant to that for straight hair (c).
If the first child born to parents who are both heterozygous for type of hair is a boy with straight hair, what is the probability that the second child will be a curly-haired son? (PLEASE NOTE: the chance that an offspring will have a particular gender, male or female, is always ½). (please show all math/work)
Parental genotypes: heterozygou Cc x heterozygous cC
Punnett square:
C
c
C
CC
curly hair-homozygous
Cc
curly hair-heterozygous
c
Cc
curly hair-heterozygous
Cc
straight hair-homozygous
Every isuse is new and independ event
Occurence of one event doesnot have affect on other
Probability 0f second child will be a curly-haired son= ¾= 0.75
C
c
C
CC
curly hair-homozygous
Cc
curly hair-heterozygous
c
Cc
curly hair-heterozygous
Cc
straight hair-homozygous