Unit 5 (Mendelian Heredity) EOC Review

The instruction of one allele covers up the instruction

of the other allele in a homologous pair. Symbolized by a capital letter.

• Recessive Allele

• Dominant Allele

• Heredity

• Trait

A genotype where one dominant and one recessive allele was passed on from both parents for one trait.

Bb Aa Tt Ll

• Allele

• Homozygous Dominant

• Homozygous Recessive

• Heterozygous

The observable traits dictated by the genotype

• Phenotype

• Genotype

• Homozygous Recessive

• Homozygous Dominant

In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?

• rr
• R
• RR
• RR or Rr

Which of the following is a phenotype?

• Aa
• red hair
• heterozygous
• DNA

A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?

• 0%
• 25%
• 50%
• 75%

Georgette wants to breed her pet phoenixes, but she isn't sure if the babies will burst into blue flames or red flames. Her documents show that her female phoenix is homozygous dominant for red flames, while her male phoenix is homozygous recessive for blue flames. What color flames will the babies have?

• Red
• Blue
• Purple
• 50% Red, 50% Blue

A child has brown hair and brown eyes. His father has brown hair and blue eyes. His mother has red hair and brown eyes. Which statement BEST explains why the child has brown hair and brown eyes?

• A gene mutation occurred that resulted in brown hair and brown eyes.

• Gene expression must change in each generation so evolution can occur.

• The child received genetic information from each parent

• Cells from his mother's eyes were present in the fertilized egg.

A pair of Holstein (black and white calves) that have the same parents display many similarities but also exhibit some variations. Which process best explains these variations?

• gene linkage

• sex linkage

• independent assortment

• dominance

In squirrels, the gene for gray fur (G) is dominant over the gene for black fur (g). If 50% of a large litter of squirrels are gray, the parental cross that produced this litter was most likely?

• GG x Gg

• GO x GO

• Gg x gg

• gg x gg