Genetic Test 1 Corrections

Sam and Sarah have 3 sons. What is the percent chance their next child will be a girl?

• 25%

• 50%

• 75%

• 100%

Label the following structures from largest to smallest.

• Gene → nucleus→ DNA→cell→chromosome

• Nucleus→ gene→ DNA→chromosome→ cell

• Chromosome→cell→nucleus→DNA→gene

• Cell→Nucleus→chromosome→DNA→Gene

Which list of genotypes are only heterozygous pairs?  

• AA, CC, ee

• AA, Bb, CC, Dd

• Bb, Dd, Ff

• AA, CC, ee, Ff

Mitosis and meiosis are methods of cellular division that create new cells. Compare the results of mitosis and meiosis.

• Mitosis creates 4 cells, identical to the original cell; Meiosis creates 2 cells, identical to the original cell.

• Mitosis creates 2 cells, identical to the original cell; Meiosis creates cells by asexual reproduction (budding).

• Mitosis creates 2 cells, identical to the original cell; Meiosis creates 4 cells, each contains half of the original DNA.

• Mitosis is a form of sexual reproduction; Meiosis creates 2 identical cells.

Which is the best description of offspring produced by asexual reproduction?

• They are physically and genetically identical (clone) to their parents.

• They are physically and genetically different (50%) from their parents.

• They are genetically different and physically identical to their parents.

• They are genetically identical to their parents, but physically different.

An organism’s traits are the result of genes (inherited) and the environment (acquired). Which trait may change due to environmental (acquired) factors?

• attached earlobes

• blood type

• dimples

• height

Why would the offspring resulting from fertilization (sexual reproduction) have more variations than offspring resulting from budding (asexual reproduction)?

• During budding (asexual reproduction), both parents provide all of their genes to their offspring.

• During budding (asexual reproduction), each parent provides half of its genes to its offspring.

• During fertilization (sexual reproduction), both parents provide all of their genes to their offspring.

• During fertilization (sexual reproduction), each parent provides half of its genes to its offspring.

Freckles (F) are dominant to no freckles (f). The diagram shows a cross between a homozygous dominant parent (FF) and a parent of unknown genotype. What is the genotype and phenotype of the missing parent?  

• Homozygous dominant for freckles

• Heterozygous for freckles

• Homozygous recessive for no freckles

• Heterozygous for no freckles

The Punnett square shows a cross between two pea plants, one with round seeds (R) and the other with wrinkled seeds (r). Which statement is true about the above genetic cross?

• both parents are heterozygous

• the trait is codominant

• both parents are homozygous

• one parent is heterozygous, the other parent is homozygous

In an experimental cross between pea plants, 8,000 seeds were created; 6,000 yellow (Y) and 2,000 green (y) seeds. What are the genotypes of parents for the offspring in the chart?

• Yy x Yy

• YY x yy

• Yy x yy

• YY x YY