Genetics Unit Review

Homozygous individuals have 2 identical alleles?

• True

• False

Answer explanation

Homo means same

If a trait is sex-linked, the gene is found on the autosome.

• True

• False

Answer explanation

Sex-linked means on the X chromosome. All other chromosomes beyond X & Y are called autosomes.

Which of the following is the genotype for a heterozygous individual?

• RR

• Rr

• rr

• Red

Answer explanation

Hetero means different

When several genes influence a characteristic, the characteristic is said to be?

• Polygenic

• Co-Dominant

• Incomplete Dominant

• Complete Dominat

Answer explanation

Poly means many

Which of the following traits is controlled by multiple alleles in humans?

• Blood Type

• Albinism

• Colorblindness

• Eye Color

Answer explanation

Blood type has options of A, B, or O alleles

Which of the following patterns can result in an intermediate trait, such as pink flowers when crossing red and white flowers.

• Sex-linked Alleles

• Complete Dominance

• Incomplete Dominance

• Co-Dominance

Answer explanation

Incomplete results in a blending of the two traits

How is it possible that a child inherits a trait that the parents do not display?

• Parents are Homozygous Dominant

• Parents are Homozygous Recessive

• Parents are Heterozygous, but only show the recessive trait

• Parents are Heterozygous, but only show the dominant trait

Answer explanation

Parents are carriers

Which of the following is NOT used to predict the probability of a trait occuring?

• Punnett Square

• Hybrid

• Dihybrid Cross

• Pedigree

Answer explanation

Hybrid is another word for Heterozygous or Carrier

Sex-linked genetic disorders are more commonly expressed in males.

• True

• False

Answer explanation

Males have 1 X, while females have 2

An organisms phenotype is the cause of its genotype.

• True

• False

Answer explanation

This says physical appearance causes the letters you inherit in your DNA.