TEKS 7.14A define heredity as the passage of genetic instructions from one generation to the next
TEKS 7.14C recognize that inherited traits of individuals are governed in the genetic material found in the genes within
chromosomes in the nucleus
Reading a Chromosome’s Secret Code
Analysis Questions:
1. Which parent gave the allele for free earlobes? Mother
2. What is the phenotype of the offspring’s finger hair? Hair present
on fingers
3. Does the offspring have dimples? Yes
4. Which parent caused the offspring to have a widow’s peak?
Mother
5. Which parent gave the most recessive alleles to their offspring?
Father
6. Which offspring has free earlobes? George
7. What is the genotype of the offspring with attached earlobes? ee
8. Which of Lynda’s parents gave her the allele for widow’s peak?
Mother
9. What are George’s genotype and phenotype for widow’s peak?
a. genotype: Ww
b. phenotype: Widow’s peak present
10.
Would the widow’s peak be more obvious if the genotype was
WW or Ww? Explain. They would be equally pronounced…
two dominant alleles does not make a trait more obvious.
11.
Which offspring would have hair on their fingers? George
12.
Which parent gave the allele for smile dimples? Mother
13.
Which offspring has two of the same alleles for earlobes? Both
offspring are (George is homozygous dominant & Lynda is
homozygous recessive).
14.
Which offspring has two dominant alleles for cleft chin? George
15.
Which offspring is two different alleles for two of their traits?
Both (George for widow’s peak & dimples, Lynda for
widow’s peak & cleft chin).
TEKS 7.14A define heredity as the passage of genetic instructions from one generation to the next
TEKS 7.14C recognize that inherited traits of individuals are governed in the genetic material found in the genes within
chromosomes in the nucleus
Reading a Chromosome’s Secret Code
Genes that determine traits make up segments of DNA that
in turn make up chromosomes. Remember that chromosomes
occur in pairs with each chromosomes having the same genes.
Below are chromosomes that are carrying the genes for certain
traits. Study the chromosomes and then answer the questions
below.
Traits
E
E = free earlobe
e
h
H = hair on fingers
H
W
c
D
Chromosome
from mother
W = widow’s peak
C = cleft chin
D = smile dimples
w
C
d
Chromosome
from father
1. Which parent gave the allele for free earlobes? _____________________
2. What is the phenotype of the offspring’s finger hair? _________________
3. Does the offspring have dimples? ________________________________
4. Which parent caused the offspring to have a widow’s peak? ___________
5. Which parent gave the most recessive alleles to their offspring? _______
father
mother
E
E
H
H
w
W
C
d
C
D
father
Traits
E = free earlobe
mother
e
e
h
h
w
W
c
d
C
d
H = hair on fingers
George
W = widow’s peak
C = cleft chin
D = smile dimples
Lynda
Use the information above to answer the following.
6. Which offspring has free earlobes? _______________________________
7. What is the genotype of the offspring’s with attached earlobes? ________
8. Which of Lynda’s parents gave her the allele for widow’s peak? ________
9. What are George’s genotype and phenotype for widow’s peak?
a. genotype: ___________
b. phenotype: ____________________
10. Would the widow’s peak be more obvious if the genotype was WW or
Ww? ______ Explain. ________________________________________
_________________________________________________________
11. Which offspring would have hair on their fingers? __________________
12. Which parent gave the allele for smile dimples? ___________________
13. Which offspring has the same alleles for earlobes? _________________
Explain. __________________________________________________
14. Which offspring has two dominant alleles for cleft chin? _____________
15. Which offspring has two different alleles for two of their traits?
__________________ Explain. _______________________________
_________________________________________________________