Science worksheets for class 7
Access printable science worksheets for class 7
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
recessive
dominant
both
T - tall and t = short
In the Punnett square, what belongs in the missing square?
tt
Tt
TT
G = green, g = yellow
The genotype for a yellow plant is...
GG
Gg
gg
all of the choices result in yellow
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
0%
25%
50%
75%
In plants, tall (T) is dominant to short (t). Perform the following cross: Tt x Tt. What is the probability of producing a short plant?
0%
25%
50%
75%
Which of the following alleles is purebred recessive?
Tt
tt
TT
Two brown eyed parents (Bb) have a baby. What is the chance their baby is blue eyed?
0 %
25%
50%
75%
Each one of the boxes on the Punnett square represents what probability of an offspring's genotype?
25%
1%
10%
0%
Aa, DD, Ba, and yy are all examples of ---
genotypes
phenotypes
AA and Aa always show up as ---
dominant.
recessive.
What is ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness? T = tall t = short
0 in 4
1 in 4
2 in 4
4 in 4
Which of the following genotypes is homozygous dominant?
aa
Aa
AA
Which of the following genotypes is heterozygous?
Bb
BB
bb
A trait controlled by a recessive allele only appears in the organism's phenotype ---
if the organism is a hybrid.
if the organism does not have any dominant alleles.
if the organism is a purebred.
Brown eyes are dominant over blue eyes. What is the probability that the offspring will have brown eyes in this cross?
25%
50%
75%
100%
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