LS Ch 5 Test

Front

What is the genotype of a heterozygous yellow pea plant?

Back

Yy

Front

What does it mean if alleles for a trait are different?

Back

Heterozygous

Front

If round seeds (R) are dominant over wrinkled seeds (r), what percentage of offspring will be round from a Rr X Rr cross?

Back

75%

Front

What does it mean if alleles for a trait are the same?

Back

Homozygous

Front

In guinea pigs, if a short haired SS guinea pig is crossed with a long haired ss guinea pig, what are the possible genotypes of their offspring?

Back

4-Ss, 100% short haired

Front

Define homozygous.

Back

Having two identical alleles for a trait.

Front

Define heterozygous.

Back

Having two different alleles for a trait.

Front

What is the phenotype of an organism?

Back

The observable characteristics or traits of an organism.

Front

What is a dominant allele?

Back

An allele that expresses its trait even in the presence of a recessive allele.

Front

What is a recessive allele?

Back

An allele that only expresses its trait when two copies are present.