Genetics and Meiosis Review

What is the best definition of genotype?

• the physical appearance of an organism
• set of alleles for a given trait

What is an allele?

• an alternative form a gene
• a mutated form a gene
• the correct form a gene
• the gene that is expressed

Which genotype represents a recessive trait?

• PP
• pp
• Pp

Recessive traits are always homozygous.

• True
• False

Which statement is true of a plant with genotype TT and another with genotype Tt?

• each would have differing phenotypes
• all alleles are dominant
• all alleles are recessive
• both have the same phenotype

Which statement is true of the plant offspring using the Punnett Square below?
T= Tall t= Short

• 50% of the offspring will be short
• 100% of the offspring will be dominant
• 75% of the offspring will be tall.
• 25% of the offspring will be tall.

Which is an example of incomplete dominance?

• the adult height of a human
• Blood types
• hair color in humans
• a pink snap dragon flower with red and white parents

The law of segregation states that __________.

• alleles for different traits are distributed independently
• only one form of the trait will appear in the offspring
• allele pairs separate during gamete formation

____ of offspring would have the same phenotype as the parents if the cross was Yy by Yy?

• 25%
• 50%
• 75%
• 100%

What is the ratio of offspring when 2 heterozygous plants (Tt) for a certain trait are crossed?

• 50% TT : 50% Tt
• 50% TT : 50% tt
• 100% TT : 0% tt
• 25% TT : 50% Tt : 25% tt