Genetics 1 H

What is an example of a phenotype?

• two identical alleles for nose size

• an allele for yellow flower color within a flower's genome

• a gene that dictates how big someone's nose will be

• yellow flower color

Which term best describes the purpose of a Punnet Square?

• analyze

• conclude

• predict

• test

Which statement correctly describes an organism that is heterozygous for a trait?

• It has two different alleles for that trait.

• It may express the dominant or recessive version of that trait.

• It will express only the recessive version of that trait.

• It inherited only one allele for that trait from its parents.

A student wrote the following list of descriptions for a plant. Which item(s) on the list describe(s) the plant's genotype?

1. has purple flowers

2. has two alleles for flower color

3. reproduces asexually

• 1

• 2

• 1 and 3

• 1, 2, and 3

An organism's ___________ is its combination of alleles

• blood

• genotype

• Heredity

• DNA

The term DOMINANT means... (Choose the one best answer)

• TWO copies of the gene must be inherited to be 'expressed'

• At least ONE copy of the gene must be inherited to be 'expressed'

• The gene is beneficial to the organism.

• The gene is strong.

Tags

NGSS.HS-LS3-1

The term recessive means....

• The trait / allele needs to be inherited from both parents when the trait is autosomal.

• The trait is 'over powered' by the dominant trait, when both are present in the person's genes.

• The trait needs only to be inherited from ONE parent when the trait is autosomal.

• The trait is dangerous or harmful to the organism.

The physical appearance of an organism based on traits

• Genotype
• Phenotype
• Meiosis
• Genetics

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A student completed a monohybrid cross involving apple trees. He concluded that 50 percent of the first generation of offspring will definitely be homozygous for skin texture. Which of the following best explains why the student's conclusion is incorrect?

• Monohybrid crosses are unreliable for making predictions about first-generation offspring.

• Monohybrid crosses can be used to determine the likelihood of an offspring's genotype only.

• both

• neither

Which statement compares genes and alleles correctly?

• Alleles were not discovered by Mendel, but genes were.

• Alleles can be passed on to offspring, but genes cannot.

• Alleles are larger than genes.

• Alleles are different molecular forms of a gene.