AP Biology Heredity

Imagine you are performing a cross involving seed color in garden pea plants. What F₁ offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green.

• 100 percent yellow-green seeds
• 100 percent yellow seeds
• 50 percent yellow, 50 percent green seeds
• 25 percent green, 75 percent yellow seeds

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A recessive trait will be observed in individuals that are ________ for that trait.

• heterozygous
• homozygous or heterozygous
• homozygous
• diploid

Meiosis results in ______.

• 4 genetically distinct haploid gametes
• 2 genetically distinct cells
• 2 genetically identical cells
• 4 genetically identical cells

The chromosomes that pair up during meiosis, are called __________ chromosomes.  

• homozygous 
• asexual
• homologous
• genes

When an area of a chromatid is exchanged with the matching area on a chromatid of its homologous chromosome, _________________ occurs

• crossing over
• mutagenesis
• hybridization
• fertilization

The observable outward manifestation of the genes of an individual is referred to as its

• blueprint
• genotype
• phenotype
• genetic map

Unlike Mendel's experiments, when a very tall person and a very short person mate, the children are variable in height. Why is one trait (tall or short) not dominant over the other?

• the gene for height in humans has incomplete dominance
• the gene for height has multiple co-dominant alleles
• height in not controlled by genes in humans
• human height is controlled by multiple genes

One of the main reasons genes assort independent of one another  is that 

• they produce unrelated traits
• they produce related traits
• they are on the same chromosome
• they are on different chromosomes.

Chromosomes that do NOT play a role in determining the sex of an individual are called

• sex chromosoems
• X and Y
• autosomes
• A and B are correct

In humans, hemophilia is an X-linked recessive trait. If a man and a woman have a son who is affected with hemophilia, which of the following is definitely true?

• The mother carries an allele for hemophilia
• The father carries an allele for hemophilia
• The father is afflicted with hemophilia
• both parents carry an allele for hemophilia

Tags

NGSS.HS-LS3-1