Mendel 15
The phenotypic ratio of the F2 generation in Morgan’s experiment on gene linkage in
drosophila fly was:
3:1
41,5%:41,5%:8,5%:8,5%
9:3:3:1
1:2:1
The phenotypic ratio of the F2 generation in Mendel’s experiment on independent
assortment was:
3:1
41,5%:41,5%:8,5%:8,5%
9:3:3:1
1:2:1
If a male who is heterozygous for an autosomal trait mates with a female who is also
heterozygous for that trait, what percent of their offspring are likely to be
heterozygous for this
50%
25%
100%
75%
In Mendel's F2 generation, one out of four plants had white flowers because
the trait is sex-linked
both parents were heterozygous purple
one parent was homozygous recessive
both parents were heterozygous white
In the F2 generation, the 3:1 phenotipic ratio is really a disguised
1:2:1
2:1:1
1:1:2
4:0
In the cross MMnn x mmNN, what proportion of the resulting F1 would be
homozygous dominant for both genes?
none
1/16
3/16
all
In a cross of a round hybrid pea with a true breeding round parent (Ww x WW), what
genotypic proportions would be observed in the offspring?
Half heterozygous, half homozygous dominant
Half round, half wrinkled
All heterozygous
All round
What ratios typically result from crosses dealing with a single genetic locus?
9:3:3:1, 1:2:1
1:1:1:1, 1:4:6:4:1
3:1, 1:1, 1:2:1
9:7, 12:3:1
There are three different genotypes resulting from a monohybrid cross. How many
different genotypes would there be resulting from a dihybrid cross?
4
8
9
16
Starting with a cross between AA and aa, the proportion of heterozygotes in the F2
progeny will be ___.
1/8
1/4
1/3
1/2
Starting with a P generation with genotypes AABB x aabb. Based on classical
Mendelian inheritance, what is the expected phenotypic ratio observed among the F2
progeny?
9:3:3:1
1:2:1
3:3:1:1
1:1:1:1
A species of mice can have gray or black fur and long or short tails. A cross between
black-furred, long-tailed mice and gray-furred, short-tailed mice produce all blackfurred, long-tailed offspring. Using the gene symbols G for black, g for gray, S for
long and s for short, what would be the genotype of a gray-furred, short-tailed
mouse?
GGSS
ggSS
ggss
GgSs
In a F1 dihybrid cross (WwGg X WwGg) where W = round, w = wrinkled, G = yellow
and g = green, what is the probability of obtaining an individual that is wrinkled,
green and true-breeding?
1/16
1/2
9/16
3/16
What genotype is present most often among the progeny (F2) of a dihybrid cross
(AaBb X AaBb)?
AaBb
AABb
AABB
AAbb
What type of cross produces a 1:1:1:1 phenotypic ratio?
AaBb x aabb
AaBb x AaBb
AABb x aabb
AaBb x Aabb