HEREDITY (PART 1) (QUIZIZZ REVIEW GAME)

A trait in cows is determined by two alleles of a single gene: allele R is dominant, and allele r is recessive. What is the probability of the dominant trait being expressed in the offspring of one RR parent and one rr parent?

• 25%

• 50%

• 75%

• 100%

In a flowering plant species, red flower color is dominant over white flower color. What is the genotype of any red-flowering plant resulting from this species?

• red and white alleles present on one chromosome

• red and white alleles present on two chromosomes

• a red allele present on both homologous chromosomes

• a red allele present on at least one of two homologous chromosomes

Which statement best describes the relationship between an allele and a gene?

• An allele is a variation of a gene that can be expressed as a phenotype.

• An allele is the part of a gene that attaches to messenger RNA molecules.

• An allele is a segment of a DNA molecule that controls replication of a gene.

• An allele is the primary protein made by a gene found in a developing embryo.

What is the meaning of the word part "homo-?"

• different

• one

• cell

• same

An organism's genotype can best be defined as its __________ .

• number of recessive genes

• physical characteristics

• number of chromosomal pairs

• genetic makeup

A certain type of flower has two alleles for color (blue/purple) and two alleles for stem height (tall/short).  A tall blue flower and a short purple flower are crossed, resulting in tall blue flowers, short blue flowers, tall purple flowers, and short purple flowers.  What law does this example help to prove?

• Law of Dominance

• Law of Independent Assortment

• Law of Multiple Alleles

• Law of Segregration

One possible form of a gene that codes for a particular trait is known as __________ .

• a chromosome

• a phenotype

• an allele

• a genotype

Guinea pig coat color is determined by a single gene.  The allele for black coat color is dominant to brown.  In a cross between two black-haired guinea pigs, 20 offspring are born.  If both parents were heterozygous, probability would predict that approximately how many of the 20 offspring would have brown hair?

• 0

• 5

• 10

• 15

Organisms that have two identical alleles for a particular trait are said to be:

• hybrid

• heterozygous

• homozygous

• dominant

If a fern plant is heterozygous for a particular trait, how can the alleles that control that trait be described?

• three recessive, one dominant

• two recessive

• one dominant, one recessive

• two dominant