Mendelian Genetics. Autosomal Traits. Remediation.
1) In a certain species of animal, black fur (B) is dominant to brown fur (b).
a) Use a Punnett square to show a cross between a heterozygote and
a homozygous recessive individual. Give the % genotypes and the %
phenotypes for their offspring.
2) In a certain species of flower, red flowers (R) is incompletely dominant
to white flowers (W).
Genotype
Phenotype
a. Fill in the following
Red flower
table.
White flower
RW
b. Use a Punnett square to show a cross between a flower that is pink
and a flower that is white. Give the % genotypes and the %
phenotypes for their offspring.
c.
Draw a Punnett square to show a cross between a Palomino and a
Cremello horse. Give the % genotypes and the % phenotypes for
their offspring.
d. If Palominos are valuable horses and you were a horse breeder, how
would you maximize your profits? In other words, what horses would
you breed? Use a Punnett square to justify your answer.
Tongue rolling
4) Look at the pedigree to the right.
a) Is the trait dominant or recessive?
b) Is the trait X-linked or autosomal?
c) Fill in the genotypes for all the individuals in
the pedigree.
3) In horses there is a gene that codes for color (this is a different gene
than the one we talked about in class). Cremello horses are very light in
color and are homozygous recessive. Light chestnut horses have a
brown body and mane and they are homozygous dominant. Palomino
horses have tan bodies and white manes and tails. They are
heterozygous.
a. Fill in the following table.
Genotype
BB
c.
Bb
bb
b.
Phenotype
Tay-Sachs disease
5) Look at the pedigree to the left.
a) Is the trait dominant or recessive?
b) Is the trait X-linked or autosomal?
c) Fill in the genotypes for all the
individuals in the pedigree.