Unit 3 Flashcards
What is the term used to describe when the members of a pair of homologous chromosomes do not move apart in Meiosis I?
Nondisjunction
Name the type of chromosomal mutation where a lost segment of one chromosome attaches itself to a nonhomologous chromosome.
Translocation
Name one type of sex chromosomal disorder where there is an uneven number of sex chromosomes. Include the genotype of the disorder.
XO - Turner Syndrome
Out of the two ways to do a karyotype on a fetus, which one is the quickest?
CVS
What is trisomy 18 called?
Edwards syndrome
T or F. The incidence of Down syndrome increases with the age of
the mother.
True
Give one example of an autosomal recessive disorder.
-Albinism
-Cystic Fibrosis
-Sickle cell disease
Give one example of an autosomal dominant disorder.
-Alherizmers
-Achodroplasia
-Polydactyly
T or F. Some mutations are beneficial.
True
What is the inactivated X chromosome in females called?
Barr body
A widow’s peak is a dominant trait over having no widow’s peak. What phenotype
would a heterozygous individual display?
Widow´s peak
A woman, who is blood type B has a child who is type O. What is this woman’s
genotype?
I(B)i
Snapdragons are a type of flower that exhibits incomplete dominance. When red flowers are crossed with white flowers, the next generation all have pink flowers. What term is used to describe the genotype of the pink flowers?
heterozygous
What term is used to describe when two or more genes alter the expression of another gene?
Epistasis
Tall stems are dominant to short stems and inflated pods are dominant to
constricted pods. List all the possible gametes that a true breeding inflated pod,
tall stemmed plant could produce.
TI (four of them)
In pea plants, purple flower color is dominant to white flower color. You have a
purple flower and want to determine its genotype. Name the type of cross you
would perform that would accomplish this.
Testcross
Genes A, B, and C all influence the same trait. What type of inheritance is this?
Polygenic Inheritance
You are examining the inheritance of two traits but find that they behave as if only one trait is being passed on. Briefly, what could explain these findings?
They are linked
What term is used to describe when one gene alters the expression of 2 or more
traits?
pleiotropy
Again, the purple flower color is dominant to white flower color. If a heterozygous plant is crossed with a white flowered plant, what is the phenotypic ratio of the resulting offspring?
2
