Genetics Practice Problems for Discussion

Practice flashcards created to review key genetic concepts and principles covered in the lecture.

Which of the following genotypes is heterozygous at two loci?

AaBb

What is the incorrect statement about gene by environment interactions?

For most traits, either NATURE or NURTURE plays a dominant role in shaping the phenotype.

What is the conclusion regarding the Cavendish banana's ability to reproduce?

It is unable to undergo normal meiosis and does not reproduce sexually.

How does the genotype of the albino female mouse and brown male impact their offspring?

The albino was aa, the brown mouse was AA. All offspring are Aa (brown).

What does the law of independent assortment state?

Within a few decades of its description by Mendel, violations were found.

What is the probability that the first child of a man with AB blood and a partner with O blood has type A blood?

1/2

What is likely to be correct regarding a child born intersex?

This child may or may not have abnormal sex chromosomes.

Which species does NOT have chromosomal sex determination?

American alligators

Which organism has the largest genome?

Rice (Oryza sativa)

How many gametes can AaBbCCDD produce?

4

What does the fossil record support?

It supports Darwin’s theory but shows sudden extinction and replacement not predicted by Darwin.

Who was Alfred Russel Wallace?

An English naturalist that developed a theory of evolution by natural selection.

What is the genotype ratio for a cross between two pink Four o' Clock plants?

The proportion of pink offspring = 1/2.

What dominant traits are exhibited in a Drosophila cross between Line A and Line B?

Normal eyes and wings.

What is the expected offspring ratio from a mating of two saddleback Blue Tilapia?

Expected offspring: 1/4 SS (dead), 1/2 Ss (saddleback), 1/4 ss (normal).

In the Drosophila F1 generation, what percentage is eyeless?

25% eyeless.

In the genetic outcome of two saddleback fish, how many survivors can be expected to be saddleback?

Out of 100 survivors, ~67 will be saddleback.

What is the genetic makeup of the albino mouse in the mating scenario?

The albino mouse was aa.

What does independent assortment imply about identical twins?

Independent assortment means that even identical twins cannot be genetically the same.

How is the blood type ratio determined in the offspring of a man with AB blood?

Children can inherit A or B from him and O from the partner.

What role do environmental factors play in genetic traits?

Environmental influences occur prenatally and during early childhood development.

What is the result of a triploid condition in the Cavendish banana?

It is unable to undergo normal meiosis and does not reproduce sexually.

What mating implications arise from an albino and normal brown mouse?

All offspring are brown, indicating that the brown mouse is likely homozygous dominant.

What trait dominates in Four o' Clock plants when red and white are crossed?

The red trait dominates over the white trait.

What do some medical conditions reflect about genetics and environment?

They are caused by a combination of genetic and environmental factors.