The Punnett square below shows the genotypes for offspring produced from a cross between a red cow and a white bull.
If all of the offspring have roan coats—white hairs mixed into a base coat of red—what can be said about the red and white alleles for coat color?
A.
Red is dominant and white is recessive.
B.
They are codominant.
C.
White is dominant and red is recessive.
D.
They are sex-linked.
A. Red is dominant and white is recessive.
In pea plants, tall (T) plants are dominant over short (t) plants. If a heterozygous (Tt) pea plant is crossed with a homozygous dominant (TT) pea plant, all of the resulting pea plants should be tall (TT or Tt). Each plant will receive a dominant allele from the homozygous dominant plant, while they could receive either a dominant or recessive allele from the heterozygous plant.
The fact that each plant gets only one allele from each parent plant is detailed in the law of _______.
A.
genetic inheritance
B.
independent assortment
C.
segregation
D.
multiple alleles
C. segregation
Lisa breeds snakes. She bred a solid brown male python with a tan female python whose body was covered with a black diamond pattern. Upon hatching, all of the baby pythons were brown with a faint diamond pattern.
Which of the following inheritance patterns most likely determined the color of Lisa's baby pythons?
A.
incomplete dominance
B.
autosomal dominant-recessive
C.
codominance
D.
sex-linked