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Trait G is dominant to trait g. What are the genotypes of offspring when a heterozygous male is crossed with a homozygous recessive female?
2 Gg, 2gg
In guinea pigs, short hair (S) is dominant to long hair (s). Two heterozygous guinea pigs are crossed. What is the expected ratio of short haired guinea pigs to long haired guinea pigs?
3:1
In monkeys, being playful (P) is dominant to being paranoid (p). A heterozygous female is crossed with a homozygous dominant male. What are the possible genotype(s) of their offspring?
PP and Pp
In horses, black coloring (B) is dominant, and chestnut coloring (b) is recessive. A homozygous black horse crosses with a chestnut horse. What percentage of offspring are expected to be chestnut?
0%
If a parent is Aa and the other parent is also Aa, what are the possible genotypes of their offspring?
AA, Aa, aa
What is the difference between genotype and phenotype?
genotype: combination of alleles, phenotype: how the trait actually looks
A black rabbit (BB) is crossed with a white rabbit (bb). What color will the babies be?
all be Bb, so black
If both parents are homozygous recessive, what is the chance of them having a child with the dominant trait?
0%
What are the genotypes of a cross between a homozygous dominant individual and a heterozygous individual?
half homozygous dominant, half heterozygous
Two heterozygous brown-eyed parents (Bb) have children. What is the probability their child will have blue eyes?
25%
A heterozygous round seed plant (Rr) is crossed with a wrinkled seed plant (rr). What is the probability of getting a wrinkled seed?
50%
If a purebred black dog (BB) is crossed with a heterozygous black dog (Bb) what color(s) will their offspring be? (B = black, b = white)
all black
What do the letters in a Punnett square represent?
They represent alleles, which are different versions of a gene
How many pairs of chromosomes do humans have?
23 pairs (46 total)
What are the two different alleles?
Dominant and recessive
Which is the recessive trait?
Blue eyes
