Genetics and Punnett Squares (9.19)

Front

In pea plants, the tall allele is dominant to the short allele. What is the correct representation of these alleles?

Back

Tall = T, Short = t

Front

What is a section of the DNA strand that determines a specific trait?

Back

gene

Front

In a heterozygous genotype, which allele takes over in the phenotype?

Back

dominant

Front

What is the probability that the offspring born from a cross between two heterozygous parents (Tt x Tt) will have a homozygous dominant genotype?

Back

25%

Front

How are dominant alleles represented?

Back

by a capital letter

Front

What is the term for an alternative form of a gene?

Back

allele

Front

What is the genotype of an organism with two identical alleles for a trait?

Back

homozygous

Front

What is the genotype of an organism with two different alleles for a trait?

Back

heterozygous

Front

What is the expected phenotypic ratio of a monohybrid cross?

Back

3:1

Front

What is the term for the physical expression of a trait?

Back

phenotype