Test Cross and Independent Assortment Daily

To discover whether an animal showing the dominant trait is homozygous or heterozygous, it must be crossed with an animal that is:

• homozygous dominant

• homozygous recessive

• heterozygous

Two tall pea plants are crossed, producing 105 tall plants & 32 short plants. Tall (T) is dominant. Short (t) is recessive. The genotypes of the tall parent plants are:

• Tt & Tt

• TT & Tt

• TT & TT

• tt & tt

A spotted dalmation is mated with a pure-white dalmation (ss) to determine whether its genotype is SS or Ss for spots. Three puppies are born, two with spots and one all white. We can conclude that the spotted dalmation parent is SS.

• TRUE

• FALSE

In mice brown (B) is dominant to white (b). A brown mouse is mated with a white mouse. Twelve brown mice are produced. The brown mouse's genotype is:

• BB

• Bb

• bb

• a reliable conclusion can't be reached

In a test cross to determine whether a fruit fly is homozygous (WW) or heterozygous (Ww) for long wings, 7 long-winged flies & 1 short winged-fly are produced. Which is a valid conclusion?

• the fruit fly is WW

• the fruit fly is Ww

• the fruit fly is ww

• more offspring are needed

The following genotypes are ​ (a)   ​ : Tt, Mm and Gg​ ​

• heterozygous
• homozygous
• true-breeding
• recessive

The following physical descriptions are ​ (a)   hair color, eye color, height.

• phenotypes
• genotypes

The same gene can come in different versions, the different versions of a gene are called

(a)  

• Alleles
• Chromosomes
• Traits

Different traits are inherited independently of each other

• Law of Independent Assortment

• Law of Segregation

• Law of Dominance

When setting up a punnett square with two traits, we use the FOIL method from algebra to get our gametes (allele combinations) for the cross. If the genotype is AaBb, what gametes could the individual have?

• AB, AB, ab, ab

• Ab, Ab, aB, aB

• AB, ab, Ab, AB

• AB, Ab, aB, ab