Exam 1

Question 1

T/F
The sex chromosome, X and Y, are not considered homologous as they have different size and shape, and lack corresponding genes.

Answer 1

True

Question 2

T/F

Regression is the amount of change expected in one variable based on its correlation coefficient to another variable.

Answer 2

False
For a given amount of change
Not correlation coefficient

Question 3

T/F

When a zygote is formed the genotype of an animal is established for the lifetime of the animal

Answer 3

True

Question 4

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

Answer 4

True

Question 5

T/F

A Punnett square is a two dimensional grid used to determine the possible zygotes obtainable from a mating

Answer 5

True

Question 6

T/F

The testicles of a male and the ovaries of a female produce zygotes by a process called gametogenesis

Answer 6

False

Gametes

Question 7

T/F

Over-dominance means heterozygote posses more vigor or are more desirable than either of the homozygotes

Answer 7

True

Question 8

T/F

When Epistasis is occurring we see interaction of genes at different loci

Answer 8

True

Question 9

T/F

When sperm and eggs unite, it establishes the paired condition of chromosomes in the zygote

Answer 9

True

Question 10

T/F

A zygote is termed diploid, because it contained chromosomes in pairs

Answer 10

True

Question 11

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

Answer 11

False

-1 to 1

Question 12

T/F

Standard deviation is a measure of how traits (or values) vary together in a population

Answer 12

False

Covariation

Question 13

T/F

Some traits are referred to as sex-influenced when modes of gene expression differ between the sexes

Answer 13

True

Question 14

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.

Answer 14

True

Question 15

A measure applied to an individual

Answer 15

Value

Question 16

Similar chromosomes carrying the same types of genes?

Answer 16

Homologous chromosomes

Question 17

The union of the sperm and egg?

Answer 17

Fertilization

Question 18

Have only one member of each pair of chromosomes, therefore called haploid

Answer 18

Both gametes and sperm

Question 19

Traits such as scrotal circumference or milk production are examples of

Answer 19

Sex limited traits

Question 20

The fundamental unit of inheritance

Answer 20

Gene

Question 21

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?

Answer 21

Meiosis

Question 22

Gametogenesis as it occurs in females is termed?

Answer 22

Oogenesis

Question 23

Which of the following is not an accurate description of a normal distribution?

Answer 23

Accurately describes the distribution of threshold traits

Question 24

Quantitative traits?

Answer 24

Have phenotypes that show continuous numerical expression (not categories)
Typically are influenced by many genes (polygenic)

Question 25

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

Answer 25

Selection