Genotype vs. Phenotype
Which one shows up on the outside: genotype or phenotype?
Phenotype
How many boxes are in a standard Punnett square?
4
Which type of reproduction creates more genetic variety?
Sexual
Who chooses which traits are passed on in selective breeding?
Humans
If a question asks for physical appearance, what word should you look for?
Phenotype
If a plant’s genotype is Bb, what type of trait will be shown?
Dominant trait
In a Bb × bb cross, what percent of offspring are heterozygous?
50%
Which type produces clones?
Asexual
Is selective breeding natural or artificial selection?
Artificial
If a question asks for letter combinations, what word should you look for?
Genotype
Can two organisms have the same phenotype but different genotypes?
Yes
In a Bb × Bb cross, what percent show the recessive trait?
25%
Why do siblings look similar but not identical?
They get different combinations of genes
Give one example of a selectively bred organism
Dogs, crops, cattle, etc.
If a trait skips a generation, which type is it likely to be?
Recessive
Which genotype(s) would show a recessive trait?
Homozygous recessive
What genotype ratio comes from a heterozygous × heterozygous cross?
1 BB : 2 Bb : 1 bb
What happens to variation in a population that reproduces only asexually?
Very little variation
Why might farmers use selective breeding?
More food, stronger animals, better traits
If all offspring show the dominant trait, what must be true about at least one parent?
One parent is homozygous dominant
If two parents both show the dominant trait, could they have a recessive offspring?
Yes, if both are heterozygous
If a parent can only pass on recessive alleles, what must their genotype be?
Homozygous recessive
Why is variation important when the environment changes?
Some individuals may survive better
What problem can happen if too much selective breeding occurs?
Less variation / genetic disorders
If variation is low in a population, what might happen if disease spreads?
Many individuals could die