Punnet Squares
Vocabulary
Identify the Phenotype
It Runs In Your Genes
100
In a lobster, claw size is controlled by one gene. The "B" allele codes for big claws and is dominant, "b" codes for small claws. if a homozygous dominant lobster and a lobster with small claws reproduced, what would the phenotype be of all the offspring?
Big claws
100
When a gene can exhibit different traits, those possible traits are often represented as uppercase or lowercase letters, what are those known as?
Alleles
100
In crabs, the color red (R) is dominant over blue (r). What is the phenotype of a crab with the genotype rr
Blue
100
Who was the man who first discovered the principles of heredity by studying peas?
Gregor Mendel
200
In a flower the color red (R) is dominant to the color white (r). What is the probability of having a white offspring if two homozygous red flowers reproduce?
0%
200
The visible trait, exhibited by the genotype is known as what?
Phenotype
200
In seagulls long wings (L) are dominant over short wings (l). What is the phenotype of a seagull with the phenotype Ll ?
Long
200
The name for the handy table that allows you to predict the possible outcomes of a cross.
Punnet Square
300
What is the fathers genotype?
Rr
300
The resulting offspring of two parents (P) are referred to as what generation?
F1
300
In sheep, wool color is controlled by incomplete dominance. With "B" coding for black, and "b" coding for white. What would the phenotype of a sheep with the genotype Bb?
Grey
300
When an organism has two different alleles, its genotype is known as what?
heterozygous
400
In a cat, ear floppiness is controlled by one gene. the "S" allele codes for straight ears and is dominant, while "s" codes for being floppy. If a cat with floppy ears and a heterozygous cat mate, what is the probability of them having an offspring that is heterozygous?
1/2, or 50%
400
When two alleles are not dominant over one another, and they both appear separately, without blending on an organism - it is known as what?
Codominance
400
In cats, fur color is controlled by codominance. "O" codes for orange and "W" codes for white. What would the phenotype be of a cat with the genotype OW?
White and Orange
400
What does it mean for an organisms genotype, if it is "true-breeding"?
its homozygous.
500
In a dog, hair is controlled by a system of incomplete dominance. "S" codes for straight, and "s" codes for curly. Heterozygous individuals exhibit wavy hair. If two heterozygotes reproduced, what is the probability their offspring also have wavy hair?
50%
500
A cross where in you observe two different traits is known as what?
two-factor cross, or dihybrid cross
500
In rabbits fur color is controlled by multiple alleles. Black Fur is B, white is b, grey is bg, brown is bb. What would the phenotype be of a rabbit with the genotype Bbg.
Black fur.
500
The debate as for what is more important in influencing development, the environment or our own genetics is also known as what?
Nature vs. Nurture.