Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
26 Cards in this Set
- Front
- Back
|
What is incomplete dominance?
|
When heterozygous individuals show an expression of the trait that is intermediate between the expressions displayed by homozygous individuals.
|
|
|
In incomplete dominance the phenotypic ratio _____ the genotypic ratio
|
Equals
|
|
|
Crosses involving single characters are called?
|
Monohybrid crosses
|
|
|
Crosses involving two characters are called?
|
Dihybrid crosses
|
|
|
What are the two types of dihybrid crosses?
|
A. the genes are on different chromosomes
B. the genes are on the same chromosome |
|
|
What is linkage?
|
When genes are literally linked together
|
|
|
What is a linkage group?
|
The reference to the chromosome from a genetic point of view
|
|
|
What is crossing over?
|
A. occurs randomly along the length of a chromosome
B. does NOT occur at the centromere C. can occur at more than one point on a chromosome during a single meiosis D. is more likely to occur the farther that two genes are separated from each other |
|
|
Cross-over units are referred to as?
|
Centimorgans
|
|
|
What is a genetic map?
|
The distance between the genes on the chromosome
|
|
|
What are sex chromosomes?
|
An exception to the rule that homologous chromosomes are identical because they are homologous in the sense that they pair up during meiosis and mitosis and always determine the sex of the organism
|
|
|
The larger chromosome is the?
|
X chromosome
|
|
|
The smaller chromosome is the?
|
Y chromosome
|
|
|
What are autosomes?
|
Non-sex chromosomes
|
|
|
Humans have ___ autosomes and ___ sex chromsomes.
|
44 and 2
|
|
|
Who discovered the Genic Balance mechanism of sex determination?
|
C.B. Bridges
|
|
|
Female sex chromosomes are?
|
XX
|
|
|
Male sex chromosomes are?
|
XY
|
|
|
The expression of sexual characteristics is determined by?
|
The ratio of the number of
X-chromosomes to the number of haploid sets of autosomes. |
|
|
The haploid sets of autosomes for males is?
|
1:2
|
|
|
The haploid sets of autosomes for females is?
|
2:2
|
|
|
The haploid sets of autosomes for supermales is?
|
1:3
|
|
|
The haploid sets of autosomes for superfemales is?
|
3:2
|
|
|
The haploid sets of autosomes for intersex is?
|
2:3
|
|
|
What is XXY Klinefelters Syndrome?
|
When all the autosomes are normal, but they have an extra sex chromosome. Phenotypically they are males, but tend to have enlarged breats, small testes, and small prostate glands, so they are usually sterile and some have mental problems (retardation)
|
|
|
What is X Turner's Syndrome?
|
The person has normal autosomes, are typically female, but never show characteristics of mature women and have incomplete development in ovaries (sterile), are short in height, have low set ears, and accumulation of skin on their neck
|
