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Mendelian Genetics Contiued
Test Description: Test Review
Instructions: Answer all questions to get your test result.
1) Two plants are crossed, resulting in offspirng with a 3:1 ratio for a particular trait. This suggests
A
incomplete dominance
B
teh parents were true breeding for contrasting traits
C
the parents were both heterozygous
D
that a blending of traits has occured
2) When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype?
A
50%
B
0%
C
25%
D
100%
3) In cattle, roan coat color is a mixture of red and white hair. Red cattle are (RR) and white are (rr). Which of the following crosses would produce a 1:2:1 ratio?
A
roan X roan
B
red X white
C
red X roan
D
white X roan
4) A women who has normal vision marries a man who had normal vision. They have s on that is color blind. What are the possible genotypes of the child's mother and father?
A
X^BX^b, X^BY
B
X^bX^b, X^bY
C
X^BX^B, X^BY
D
X^BX^B, X^BX^B
5) If a women has type A blood, and a man has type B blood what are the possible genotypes of their offspring?
A
A, B, AB and O Blood
B
A and B Blood
C
A and O Blood
D
AB and B Blood
6) In a co-dominant cross, a black chicken is crossed with a balck and white chicken. What are the possible genotypes that can be produced?
A
only black and white
B
black, white and black & white
C
black and black & white
D
white and black & white
7) The genetic make up of an organism is called
A
dihybrid
B
genotype
C
phenotype
D
punnett square
8) What is an allele?
A
a variation in a gene
B
a sperm cell
C
a form of asexual reproduction
D
an egg cell
9) In humans, a male has
A
one X chromosome only
B
one X chromosome and one Y chromosome
C
two X chromosomes
D
two Y chromosomes
10) Human females produce egg cells that have
A
one X cromosome or one Y chromosome
B
two X chromosomes
C
one X chromosome
D
one X chromosome and one Y chromosome
*select an answer for all questions
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