Down syndrome is most common in children who are born to women

over the age of 30
under the age of 30
under the age of 25
under the age of 20
over the age of 30  

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Which term is used to describe an organism’s observable traits?
A. trait
B. genotype
C. characteristic
D. phenotype
Egg-bearing organ of a flower is called:
A. carpel
B. stamen
C. petal
D. pistil
When two alleles each affect phenotype in separate distinguishable ways, they are said to be:
A. codominant
B. semi dominant
C. totally dominant
D. incomplete dominant
Which of following scientists discovered basic rules of inheritance using pea plants?
A. Darwin
B. Mendel
C. Watson
D. crick
When phenotypic effect of a gene disrupts effect of a gene at another locus, it is called as:
A. metastasis
B. epistasis
C. pleiotropy
D. Polytropy
Which of following traits is denoted by capital letters?
A. recessive
B. absent
C. dominant
D. hidden
What was predicted character ratio for second law of inheritance?
A. 9:3:3:1
B. 9:1:3:3
C. 3:2:1:9
D. 1:3:3:1

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