ANS2L- 7.02- Genetics

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Livestock Genetics

& Punnett Squares

Multiple Choice

The situation in which one gene doesnot completely hide the effect of the other gene in a gene pair is:

• dominant

• homozygous

• incomplete dominance

• recessive

Multiple Choice

The tendency for genes that are located close together on the chromosome to stay together and pass traits in groups is:

• crossover

• incomplete dominance

• linkage

• mutation

Multiple Choice

A gene pair that carries two different genes that affect a trait is:

• blood-typing

• heterozygous

• homozygous

• pure-breeding

Multiple Choice

If a polled cow bred to a polled bull produces a calf with horns, the parents’ genotypes are:

• dominant

• heterozygous

• homozygous

• purebred

Multiple Choice

The gene in a pair that is hidden by the other gene is a:

• dominant gene

• homozygous gene pair

• phenotype gene

• recessive gene

Multiple Choice

The appearance of a new trait in the biological offspring that is not in the genetic makeup of the parents is a:

• dominant gene

• mutation

• recessive gene

• sex-linked trait

Multiple Choice

If black is dominant over red and white faces are dominant over colored faces in cattle, what color offspring would come from crossing a purebred black Angus bull with a purebred white-faced, red Hereford cow?

• black all over

• black with white face

• red all over

• red with white face

Multiple Choice

A polled bull bred to a polled cow that produces a calf that has horns is an example of:

• meiosis

• mitosis

• purebred breeding

• recessive genes

Multiple Choice

In livestock, sex-linked traits are often recessive and are covered up by:

• dominant genes

• female hormones

• male hormones

• recessive genes

Multiple Choice

For a cow to have horns, the gene pair must be:

• crossbred

• dominant

• heterozygous and dominant

• recessive and homozygous

Multiple Choice

After meiosis, one half the sperm carry an X chromosome, one half carry a Y chromosome, and all the ova carry an X chromosome. The chromosome combination that produces a male offspring in mammals is:

• X

• XX

• XY

• YY

Multiple Choice

In livestock, the traits on the portion of the Y chromosome that do not link with the X chromosome are transmitted only from:

• father to daughter

• father to son

• mother to daughter

• mother to son

Multiple Choice

A gene pair that carries two genes for the same trait is:

• blood-typing

• expected progeny

• heterozygous

• homozygous

Multiple Choice

The gene in a pair that hides the effect of the other gene is a:

• dominant gene

• homozygous gene pair

• punnett square

• recessive gene

Multiple Choice

Based on the Punnet Square, what percent of calves would have horns if a bull with homozygous dominant genes for polled (PP) were mated with a cow with homozygous recessive genes for horned (pp)?

• 0

• 25

• 50

• 100

Multiple Choice

Using the Punnet Square, what percent of calves would have horns if a homozygous polled (PP) bull were crossed with a homozygous polled (PP) cow?

• 0

• 25

• 75

• 100

Multiple Choice

Using the Punnet Square, what percent of the offspring would be white if a dominant white homozygous (WW) boar is bred to a black recessive homozygous (ww) sow?

• 0

• 25

• 75

• 100

Multiple Choice

Using the Punnet Square, what percent of the offspring would be black if a white heterozygous (Ww) boar is bred to a white heterozygous (Ww) sow?

• 0

• 25

• 50

• 100

Multiple Choice

Based on the Punnet Square, what percent of the calves would have horns if a bull with heterozygous genes for horns (Pp) were mated with a cow with heterozygous genes for horns (Pp)?

• 0

• 25

• 75

• 100