Search & Filtering
You are a researcher interested in the Dystrophin gene. The Dystrophin gene is a gene that encodes the dystrophin protein that is required for muscle function and therefore is only expressed in muscle cells. From which of the following cells types would you expect to be able to isolate the Dystrophin gene? Explain your reasoning.
Fun fact: the Dystrophin gene is the largest gene in our genome! It’s codes for a really big protein too.
Fat cells
Skin cells
Muscle cells
All of these cells
In guinea pigs, black fur is dominant over white fur. If a homozygous dominant guinea pig were crossed with a homozygous recessive guinea pig, the first generation of offspring would _____. Select all that apply.
be heterozygous
be phenotypically identical
have all black fur
have half black fur and half white fur
be homozygous
Which of the following is not an example of a trait that has more than two variations?
eye color
handedness
freckles
ability to roll tongue
Which of the following describes the state of chromosomes in metaphase II?
two chromatids joined at the centromere
individual chromosomes
homologous pair
haploid daughter cells
Which of the following statements about variation is true? Select all that apply.
Variation comes from a combination of traits from the organism's mother and father.
Variation is caused by the presence of alleles.
Variation only affects physical features such as hair color, eye color, and height.
Variation is any difference between individual cells or organisms caused by mutation.
Sometimes, two alleles are neither dominant nor recessive, therefore, both alleles are expressed separately in a heterozygous individual. This is called codominance. Which of the following is an example of codominance?
In guinea pigs, black hair is dominant over white hair. A homozygous black guinea pig is crossed with a homozygous white guinea pig. The first generation of offspring are black.
If you cross a plant with blue flowers with a plant with yellow flowers, the offspring will have blue flowers with yellow spots.
If you cross a rhododendron plant with red flowers with a rhododendron plant with white flowers, the offspring will have pink flowers.
A white female cat mates with a brown male cat. The resulting offspring are orange.
Background:
In certain types of cattle, three colors exist:
- white (WW), white hairs
- red hair (RR), red hairs
- roan (RW), a mixture of red and white hairs
Roan is a codominant condition.
Question:
A breeder wants to only produce roan-colored cattle. Which of the following parents should she select to only produce roan-colored offspring? Select all that apply.
black-haired parent
white-haired parent
roan-haired parent
red-haired parent
What is the phenotypic ratio of the offspring when a man who has type A blood, and whose mother had type O blood, marries a woman who has type AB blood?
2 type A : 1 type AB : 1 type B
3 type A: 1 type B
1 type A : 1 type O
1AA :1AB : 1AO : 1BO
Which of the following situations is the result of epistasis?
A mouse has black fur, black eyes, and black skin.
A mouse has white fur, pink eyes, and pink skin.
A mouse has white fur with black spots and black eyes.
A mouse has black fur with white spots and black eyes.
Two mice with gray fur are crossed. They produce 15 gray, 8 black, and 6 white offspring. In one paragraph, using your own words, explain the inheritance of these colors in the mice. What phenotypes would you expect in the offspring of a cross between a gray mouse and a white mouse? Be sure to include proper spelling, grammar, and punctuation.
