Unit 7 Review: Genetics

T = Tall, t = short. If I cross a plant that is homozygous dominant for height with a plant that is heterozygous for height, what will be the phenotype of the potential offspring?

• All short

• 25% short, 75% tall

• Half tall, half short

• All tall

T = tall, t = short. What would be the genotypic ratio for a cross between 2 heterozygous parents?

• 4Tt

• 1TT : 2Tt : 1tt

• 3 tall : 1 short

• 2 tall : 2 short

Y = yellow, y = green for pea plant pea color. Which of the following statements regarding phenotype is true if two pea plants that are homozygous recessive for pea color had an offspring?

• All offspring would be yellow

• There's a 50/50 chance of the offspring being green or yellow

• All the offspring would be green

• Not enough information to determine

A Punnett square is used to show what?

• The exact genotype of every offspring

• Which allele the parent will always pass down

• The phenotypes of the offspring

• The possible genotypes of an offspring

A family has 25 kids, all of whom are boys. What are the chances that they have another boy?

• 0%

• 0.000000000000000000000000000000000000000000000000000000000000000001%

• 50%

• 100%

Homozygous is 2 _______ alleles while heterozygous is 2 ________ alleles.

• same, different

• different, same

• dominant, recessive

• recessive, dominant

What two things determine a person's phenotype?

• phenotype and environment

• genotype and environment

• one allele and lifestyle

• random chance and astrology

A blue flower and red flower have the potential to have an offspring that is a purple flower. What type of inheritance is this?

• Incomplete dominance

• Codominance

• Multiple alleles

• Complete dominance

What is another term used to describe individuals that have a heterozygous genotype?

• Dominant

• Recessive

• Carrier

• Anomaly

A heterozygous type A blood (I^Ai) father and a homozygous dominant type B (I^BI^B) mother are planning on having a child. What possible blood types could this couple expect their child to be?

• Only Type A

• Type A, Type B, and Type O

• Type B, Type AB

• Type A, Type B, Type AB