Genetics Quiz #1

Alleles are best described as...

• a "stronger" version of a trait

• a matched set of chromosomes

• genetic information, ex. Rr

• different versions of a gene

• characteristics of features of an organism

Chromosomes come in _________ pairs meaning there are matching genes, one from mom, and one from dad.

• dominant

• recessive

• heterozygous

• homologous

• hybrid

A dominant allele .....

• is always more common in a population

• always determines the phenotype of an organism

• never determines the phenotype of an organism

• determines half of the phenotype of an organism

genotype

• the physical expression of genes in an organism

• the combination of genes in an organism

• characteristic of an organism

• number and visual appearance of chromosomes in an organism

another term for a heterozygous genotype is ....

• purebreed

• hybrid

• recessive

• dominant

This term refers to an allele that is masked when a dominant allele is present

• hybrid

• purebreed

• homologous

• recessive

The number and visual appearance of chromosomes in the nucleus of an organism

• genotype

• karyotype

• phenotype

• oligotype

Genetics is the study of heredity and how _________ are passed down from generation to generation

• behaviors

• haircuts

• traits

• muscle size

In humans, the allele for six fingers on one hand is dominant to the allele for five fingers. One parent is heterozygous for this trait and the other parent has five fingers. What is the probability of having a child with 6 fingers?

In lookeet parakeets, green feathers are dominant to blue. When a green parakeet is crossed with a blue parakeet, about half of the offspring have blue feathers. What are the genotypes of the parents?