Exam 1 Flashcards
T/F
The sex chromosome, X and Y, are not considered homologous as they have different size and shape, and lack corresponding genes.
True
T/F
Regression is the amount of change expected in one variable based on its correlation coefficient to another variable.
False
For a given amount of change
Not correlation coefficient
T/F
When a zygote is formed the genotype of an animal is established for the lifetime of the animal
True
T/F
The fact that a sire and a dam have produced a superior offspring in the past is no guarantee that they will produce an equally outstanding one in the future
True
T/F
A Punnett square is a two dimensional grid used to determine the possible zygotes obtainable from a mating
True
T/F
The testicles of a male and the ovaries of a female produce zygotes by a process called gametogenesis
False
Gametes
T/F
Over-dominance means heterozygote posses more vigor or are more desirable than either of the homozygotes
True
T/F
When Epistasis is occurring we see interaction of genes at different loci
True
T/F
When sperm and eggs unite, it establishes the paired condition of chromosomes in the zygote
True
T/F
A zygote is termed diploid, because it contained chromosomes in pairs
True
T/F
A correlation coefficient is a measure of the strength of the relationship between two variables in populations. Correlation coefficients are confined to a range of -2.0 to 2.0
False
-1 to 1
T/F
Standard deviation is a measure of how traits (or values) vary together in a population
False
Covariation
T/F
Some traits are referred to as sex-influenced when modes of gene expression differ between the sexes
True
T/F
Mitosis is the process by which chromosomes replicate. During mitosis each pair of chromosomes divide so that two cells are identical to the cell that divided.
True
A measure applied to an individual
Value
Similar chromosomes carrying the same types of genes?
Homologous chromosomes
The union of the sperm and egg?
Fertilization
Have only one member of each pair of chromosomes, therefore called haploid
Both gametes and sperm
Traits such as scrotal circumference or milk production are examples of
Sex limited traits
The fundamental unit of inheritance
Gene
The unique type of cell division in which gametes are formed resulting in each new gamete containing only one member of each chromosome pair is?
Meiosis
Gametogenesis as it occurs in females is termed?
Oogenesis
Which of the following is not an accurate description of a normal distribution?
Accurately describes the distribution of threshold traits
Quantitative traits?
Have phenotypes that show continuous numerical expression (not categories)
Typically are influenced by many genes (polygenic)
Since sperm (or egg) is a sample of the genetic material from that animal, we practice ____ in attempt to increase the proportion of desired alleles in the gene pool of our livestock populations
Selection
