Biology Drill: Tongue Curling Biology Drill: Tongue Curling
Name: ______Period: ___ Date:______Name: ______Period: ___ Date:______
Being able to curl your tongue is a dominant trait in humans. The dominant allele for tongue curling is “C.” The recessive allele (not able to curl tongue) is “c.”
1. Write the following genotypes:
a. homozygous dominant ______
b. homozygous recessive ______
c. heterozygous (hybrid) ______
2. People heterozygous for the tongue curling allele can curl their tongue. Circle: TRUE or FALSE
3. A homozygous dominant mother and a homozygous recessive father want to have children. What is the percent chance that these parents will have a tongue-curling child? Use a Punnett square to illustrate your answer.
4. Look at the alleles shown below and do the following:
a. circle the homozygous recessive genotypes
b. underline the genotypes in which the dominant phenotype will show
M e dd F Nn
i AA g KK
L oo Ff Ll W Cc tt B zZ
ss Pu E R SS
Being able to curl your tongue is a dominant trait in humans. The dominant allele for tongue curling is “C.” The recessive allele (not able to curl tongue) is “c.”
1. Write the following genotypes:
a. homozygous dominant ______
b. homozygous recessive ______
c. heterozygous (hybrid) ______
2. People heterozygous for the tongue curling allele can curl their tongue. Circle: TRUE or FALSE
3. A homozygous dominant mother and a homozygous recessive father want to have children. What is the percent chance that these parents will have a tongue-curling child? Use a Punnett square to illustrate your answer.
4. Look at the alleles shown below and do the following:
a. circle the homozygous recessive genotypes
b. underline the genotypes in which the dominant phenotype will show
M e dd F Nn
i AA g KK
L oo Ff Ll W Cc tt B zZ
ss Pu E R SS
5. Use the words in the box to fill in the blanks in the paragraph.
A person who studies how traits are passed on is studying ______. Long rod-shaped bodies in side a cell’s nucleus are called ______. Chromosomes have sections that determine traits. These sections are known as ______. An organism having two copies of a gene that are alike is said to be ______, but if the organism has one dominant and one recessive gene for a trait, it is called ______. The gene that is ______prevents the ______gene from showing. One method for showing possible gene combinations when an egg and sperm join is a ______.
5. Use the words in the box to fill in the blanks in the paragraph.
A person who studies how traits are passed on is studying ______. Long rod-shaped bodies in side a cell’s nucleus are called ______. Chromosomes have sections that determine traits. These sections are known as ______. An organism having two copies of a gene that are alike is said to be ______, but if the organism has one dominant and one recessive gene for a trait, it is called ______. The gene that is ______prevents the ______gene from showing. One method for showing possible gene combinations when an egg and sperm join is a ______.