24 Q Biology Draft

In this pedigree, the dominant trait, curly hair is shaded while straight hair is not. The genotype of the non-shaded individuals would be...

• Both are homozygous dominant (CC).
• Both are homozygous recessive (cc).
• Both are heterozygous (Cc)
• The male is homozygous dominant; the female is homozygous recessive.

In the F1 generation of a monohybrid cross (Ss x Ss), the phenotypic ratio would be:

• 3:1
• 2:2
• 1:1
• 1:1:2

The pedigree chart below is for a family, some of whose members exhibit the recessive trait, wooly hair. Affected individuals are indicated by an open (non-shaded) square or circle. Use the chart to answer the following questions. What is the genotype of individual B-5?

• WW
• Ww
• ww
• WW or ww
• ww or Ww

Tallness (T) is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). The heterozygous condition (incomplete dominance) results in pink (Rr) flower color. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F1 individuals?

• ttRr - dwarf and pink
• ttrr - dwarf and white
• TtRr - tall and red
• TtRr - tall and pink
• TTRR - tall and red

On a dihybrid cross, genetic traits of seeds are noted as follows: L = long, l = short W = wrinkled, w = smooth Which of the following is the genotype for a short, wrinkled?

• llWw
• LLWW
• LlWw
• llww

Genetic disorders occur because of ________________ (changes) that can happen in DNA copying.

• mutation
• transcription
• translation
• conversion

A type of mutation that doesn't result in problems with the protein...

• frameshift
• addition
• subtraction
• silent

The following terms: gly, ser, thr, arg are examples of

• DNA
• RNA
• amino acids
• nucleotides
• proteins

Proteins are important because...

• they form structural units of cells.
• they form functional enzymes that speed up reactions.
• both
• neither

Why does the cell have to create an mRNA molecule in order for proteins to be produced?

• DNA can't produce proteins but mRNA can.
• mRNA is the building blocks of proteins.
• The DNA is in the nucleus and separated from the ribosomes.
• Ribosomes can only use amino acids to form the proteins.