Genetics 1
What is genetic diversity?
The combination of genes/alleles in a breeding population.
Two blue-eyed people have kids. What is going to be true of the eye color of their children?
Their children must have blue eyes.
Hybrid =
Purebred =
Categorize the following into the sections above:
BB, Bb, bb, homozygous, heterozygous
Hybrid = Bb, heterozygous
Purebred = BB, bb, homozygous
The blue eye phenotype is recessive to the brown eye phenotype. What must be true about the genotype for having blue eyes?
It will always be bb.
True or false: mutations are always harmful.
False - they can be beneficial
Match the following three vocab words to their definitions:
Word Bank: Trait, Mutation, Heredity
(A) A permanent change to the base sequence of DNA.
(B) Process of passing down traits over time
(C) Characteristic, such as fur color
Trait = (C)
Mutation = (A)
Heredity = (B)
Two brown eyed parents have children. Some of their children have blue eyes. How is this possible?
Both parents are heterozygous (Bb) and contributed the little b to their offsprings genotype.
If B = Brown eyes and b = blue eyes what is the only parent genotype combo that will result in a 100% chance of having kids with blue eyes?
bb x bb
What is the difference between homozygous and heterozygous?
You must use the following vocab: allele, different, same, BB, Bb, bb
Homozygous: getting the same allele from each parent (BB, bb)
Heterozygous: getting different alleles from each parent (Bb).
If a population is small is it likely to have a lot of genetic variation or a little?
Little variation
Match the following three vocab words to their definitions:
Word Bank: Genetics, DNA, Allele
(A) an alternative version of a gene
(B) Large molecule containing the genetic code found in the nucleus
(C) scientific study of heredity
Genetics: (C)
DNA: (B)
Allele: (A)
Who were the winners of this years Lip Sync competition?
The Science Department of course!
Define genetic screening
Testing of populations or individuals to identify those at higher risk of carrying, developing or passing on a genetic disorder
Who is your favourite biology teacher?
Mrs Davies - will also accept Gregor Mendel or Charles Darwin
Is a self-pollinating flower considered sexual or asexual reproduction? Why?
Sexual --> "male" and "female" parts in the flower.
What are offspring? What is a 'generation'?
Offspring = babies
Generation = group of living things that are born and grow up around the same time.
100% of the offspring in a Punnett square are heterozygous. What must be the parent genotypes?
GG x gg
In a litter of puppies, their is a 3:1 ratio of brown eyes to blue eyes. Brown eyes is dominant. What are the parent genotypes?
Bb x Bb
How is a gene different from a DNA strand?
A gene is a section of DNA that codes for a trait/protein.
How might the environment impact whether a mutation is beneficial, harmful or neutral? Please explain with an example.
Answers may vary
What is the sequence of nitrogen bases that form instructions for building ONE protein called?
Please give the most specific answer possible.
Genetic code / genes
Using the following data, please work backwards to find the parent genotypes.
Fur color // Number of Offspring
Black Fur // 52
White Fur // 48
Total // 100
Ff x ff
What is the purpose of gene tracking?
To determine how genetically related individuals are in a population and to follow how specific alleles are passed through generations
A chromosome is....
a neatly wrapped DNA strand (wrapped around proteins in the nucleus of the cell)
Compare and contrast sexual and asexual reproduction for the following things:
1. Number of parent(s)
2. % DNA shared between parent(s) and offspring.
3. Benefits/Drawbacks
1. Sexual=2 Asexual=1
2. Sexual=50% Asexual=100%
3. Benefits for sexual=variation, Benefits for asexual=FAST & opposites for drawbacks