Genetics 2019

A dominant Allele is one that...

• is shown in the phenotype when present

• is only present when the recessive is not

• hides if a recessive allele is present

• is expressed by a lower case letter

If you cross a white flower (genotype = pp) with a purple (genotype = PP), the possible genotypes of the offspring are...

• "PP" and "pp"

• all 'PP'

• purplish-white

• all "Pp"

If there is at least one _________ gene in the genotype, it will show in the phenotype.

• gentype

• phenotype

• dominant

• recessive

An example of an organism with homozygous alleles would be which of the following?

• BB

• Bb

• bB

• Tt

Pretend that you're Gregor Mendel studying peas. You are noticing that you are breeding green peas together over and over. Most of the time, the offspring are green but occasionally, the offspring is yellow. What does this tell you?

• Green is dominant.

• Green is recessive.

• Yellow is dominant.

• The yellow peas were flukes.

Brown hair is dominant to blonde hair. Lisa has blonde hair but both parents have brown hair. How is this possible?

• both parents are heterozygous

• mom is homozygous

• dad is homozygous

• one parent is heterozygous and one is homozygous

A scientist crossed a purebred long-winged male fruit fly with a purebred short-winged fruit fly. Long wings are dominant over short wings. What is the probability that the offspring will have long wings?

• 25%

• 50%

• 75%

• 100%

Which of these statements correctly describes a difference between asexual and sexual reproduction?

• Asexual reproduction increases genetic diversity, but sexual reproduction does not.

• Asexual reproduction involves one parent, and sexual reproduction involves two parents.

• Sexual reproduction is always more advantageous than asexual reproduction

• The offspring produced by asexual reproduction are not identical to each other, but those of sexual reproduction are identical to each other.

In humans, the ability to roll one's tongue follows the dominant/recessive pattern of inheritance. The allele for tongue-rolling is dominant to the allele for non-tongue-rolling. If two homozygous parents can roll their tongues, what is the probability that their child will also be able to?

• 0%

• 25%

• 50%

• 100%

Factors that control a trait.

• traits

• genes

• cells

• recessive alleles