Dominance
How many alleles of the dominant trait do you need for it to show up in the phenotype?
One!
If a brown cow mated with a white cow and their children all had spots of brown and white, you would know you were dealing with what pattern of inheritance?
Codominance
Why do we not write a superscript above the Y?
The Y chromosome does not have the Gene/Allele.
Which Law states that alleles for each inherited trait separate from each other during gamete formation?
The Law of segregation
How many alleles of the recessive trait do you need to have in order for the recessive trait to show up in the phenotype?
Two!
In four o’clock plants, flower colour is determined by incomplete dominance of the alleles for red colour and white colour. If a plant with pink flowers is crossed with another plant with pink flowers, what fraction of the offspring are expected to have white flowers?
1/4
Why are men more likely to inherit an X-linked recessive trait?
Different Forms of the same gene are called what?
An Allele
A true-breeding tall pea plant is crossed with a true-breeding short pea plant. All the offspring in the F1 generation are tall. Which of the following describes the genotypes of all the individuals in the F1 generation?
Heterozygous
What are a couple words to describe how codominance is different than incomplete dominance?
Traits both show fully
Both traits are dominant
Stripes/dots/etc.
Not a mix of the two traits
A recessive X-linked trait is controlled by two alleles, B and b. What is the genotype of a woman who expresses a recessive X-linked trait?
XbXb
If an organism has two different alleles for a given trait, what do we call them?
A heterozygote
In humans, the allele for long eyelashes (E) is dominant and the allele for short eyelashes (e) is recessive. The biological mother is homozygous dominant and the biological father is heterozygous for the eyelash gene. How many kids out of 4 would be born with long eyelashes if they crossed?
4
In a particular species of cat, hair colour is a codominant trait. The cats can be black, tan, or tabby (a mix of both black and tan). What fraction of the offspring are predicted to have tan hair colour if a black cat mates with a tabby cat?
All of them, or 100%
If a man displaying an X-linked dominant trait has kids with a women who does not display the trait, what percent of daughter would display the trait?
100%
When do alleles for an inherited trait segregate?
Meiosis
A heterozygous man with dimples has children with a woman without dimples. If the allele for dimples is dominant, what fraction of their children are expected to have dimples?
Human blood type is controlled by three different alleles: IA, IB, and i. A man who is homozygous for blood type A has children with a woman who is heterozygous for blood type B. What is the predicted frequency of children with blood type AB?
One in two children, or 50%
The allele for normal blood clotting, XB, is dominant and the allele for hemophilia, Xb, is recessive. What is the combination of parental genotypes that has no chance of producing a child with hemophilia?
XBXB and XBY
The genetic makeup for a particular trait is called the:
Genotype