Font size
WorksheetsGenetics, Meiosis, Differentiation
Total questions: 22
Worksheet time: 14mins
All cells in an organism have a copy of the same DNA. If the DNA is the same, how do stem cells become so many different types of cells?
Some genes are turned on in some cells while other genes are turned off.
The different cells mutate to express different genes.
Some cells get more energy and nutrients, allowing them to go through more changes.
Each cell takes different DNA from the environment and uses that to change.
When butterflies form a chrysalis in the sunlight, they emerge as a bright butterfly, whereas if the same butterfly formed its chrysalis in the shade, it would have the same color pattern but dull instead of bright. Which genetic concept explains this phenomena?
This is an example of mutation. The radiation from the sun altered the genes in a predictable way.
This is an example of evolution. The individual butterfly adapted to match the bright conditions.
This is an example of epigenetics. Some genes were expressed or suppressed based on a non-genetic factor.
This is not genetic at all. There is not enough scientific evidence to support any conclusion. This is most likely random chance.
Which cellular structure regulates Cell differentiation?
DNA contains all the information that cells need to differentiate.
The cell membrane changes its shape to form different cells.
The mitochondria provide energy, which tells the cells how to change.
Proteins spontaneously form, giving signals to the cell to change.
Why are sex-linked traits more likely to affect males?
Sex is determined by the sperm, so sex-linked genes go from father to son
A mother's eggs are as old as she is. If the eggs are older, they are more likely to develop chromosomal mutations.
Males only have 1 X chromosome, so if it contains a mutation, they have no back-up X to protect them like females do.
Males are more likely to make foolish decisions in their life, leading to gene mutations in their offspring.
In flies, eye color is a sex-linked gene. Red eyes XR is dominant to white eyes Xr. What are the chances a heterozygous red-eyed female and a white-eyed male have a white-eyed female offspring? (I gave you time, actually work it out.)
0%
25%
50%
75%
In flies, eye color is a sex-linked gene. Red eyes XR is dominant to white eyes Xr. What are the chances a homozygous red-eyed female and a white-eyed male have a white-eyed male offspring? (I gave you time, actually work it out.)
0%
25%
50%
75%
In dogs, Brown and Black coloring alleles are considered codominant to each other. The heterozygous phenotype is called "brindle." What are the chances a brindle dog and a black dog have brindle offspring?
0%
25%
50%
75%
In dogs, Brown and Black coloring alleles are considered codominant to each other. The heterozygous phenotype is called "brindle." What are the chances of 2 brindle dogs having brindle offspring?
0%
25%
50%
75%
In dogs, Brown and Black coloring alleles are considered codominant to each other. The heterozygous phenotype is called "brindle." What are the chances of 2 brindle dogs having brown offspring?
0%
25%
50%
75%
In cattle, longhorns are recessive to short-horn and Brown is codominant with black. The brown and black mix is called "brindle." A heterozygous short-horned, brindle bull mates with a heterozygous short-horned brindle heifer. What are the chances they will have a brindle long-horn offspring? (I gave you time, work it out.)
1/8
1/4
3/16
9/16
If dominant genes hide recessive genes, and blue eyes are considered recessive. Which is the most reasonable explanation of how 2 brown-eyed parents could have a blue-eyed offspring?
A mutation occurred in the gametes used to produce this offspring. This happens regularly and predictably.
This is not possible. The hospital had to have mixed up the babies.
Eye-coloring is not a genetic trait. It is just random chance.
Both parents would have to be heterozygous for the child to receive two recessive alleles.
In humans, Dimples (D) on the skin are dominant to no dimples (d). If two parents are heterozygous for the trait, which statement below best describes their chances of having a child with no dimples?
If the parents already have three children with dimples, then they are more likely to have a child without dimples.
Every time they reproduce, the parents have a one in four chance of having a child without dimples.
It would be extremely rare for the dimpled parents to have a child without dimples because dimples are dominant.
The parents will have 3 children with dimples before they have a child without dimples.
Having a widow's peak is dominant to not having a widow's peak. Two parents with widow's peaks had a child without. Based on this information, what are the genotypes of the parents?
WW and ww
Ww and Ww
WW and Ww
ww and ww
Which is not and effect of meiosis?
Increase Genetic diversity
Reduces the number of offspring a parent can have.
Ensures the same number of chromosomes are in each cell.
Reduces diploid cells down to haploid sex cells.
Why does meiosis reduce the number of chromosomes down to half?
When a sperm with half the usual DNA meets an egg with half the usual DNA, they are able to develop into an organism with the right amount of DNA.
The other Chromosomes that are removed are considered useless and are therefore discarded by the developing cell.
Gametes don't need as much DNA as other cells. They have a limited function and therefore don't need all the DNA.
Getting rid of extra chromosomes reduces the chance of having mutations in an offspring.
Which are the correct reasons that a somatic cell undergoes Mitosis?
Organism Growth
Increase Genetic diversity
Reduce chromosome number in preparation for sexual reproduction
Replace dead or damaged cells
Which are the correct reasons that a Germ Line cell undergoes Meiosis?
Organism Growth
Increase Genetic diversity
Reduce chromosome number in preparation for sexual reproduction
Replace dead or damaged cells
What is the purpose of the process shown?
This process is called Crossover, and it increases genetic diversity
This process is called independent assortment and it shuffles the chromosomes
This process is called mutation and it mixes up the genetic material
This process is called gene-trading and it leads to genetic disorders like Down's Syndrome
Rr, Ss, and TU are considered ___________ genotypes because ______________.
Heterozygous, the alleles match
Heterozygous, the alleles don't match
Homozygous, the alleles match
Homozygous, the alleles don't match
RR, ss, and TT are considered ___________ genotypes because ______________.
Heterozygous, the alleles match
Heterozygous, the alleles don't match
Homozygous, the alleles match
Homozygous, the alleles don't match
Which is not a cell that is created by Meiosis?
Sperm
Egg
Liver cell
Gamete
Which are not cells created by Mitosis?
Sperm
Egg
Skin Cell
Brain Cell
