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1 | |
Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait are called______. |
| | A) | chromatids |
| | B) | alleles |
| | C) | DNA segments |
| | D) | centrioles |
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2 | |
People who appear normal but can pass on an allele for a genetic disorder are called ______. |
| | A) | deficient |
| | B) | recessive |
| | C) | latent |
| | D) | carriers |
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3 | |
Genotype refers to an individual's: |
| | A) | appearance |
| | B) | genes. |
| | C) | blood type. |
| | D) | ear lobes. |
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4 | |
If a person has both alleles for the dominant trait, his genotype is represented as: |
| | A) | 2 capital letters. |
| | B) | 1 capital and 1 lowercase letter |
| | C) | 2 lowercase letters. |
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5 | |
A heterozygous genotype is represented by: |
| | A) | 2 capital letters. |
| | B) | 1 capital letter and 1 lowercase letter. |
| | C) | 2 lowercase letters. |
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6 | |
Which of the following is not one of the 3 possible zygotes involving height? |
| | A) | Tt |
| | B) | tt |
| | C) | Ts |
| | D) | TT |
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7 | |
Since homologous chromosomes are separated during meiosis, the gametes will have ____ copy/copies of each allele. |
| | A) | 1 |
| | B) | 2 |
| | C) | various |
| | D) | no |
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8 | |
Given a genotype of T T, what are the possible gametes? |
| | A) | all are T |
| | B) | all are T T |
| | C) | half are T and half are t |
| | D) | cannot tell |
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9 | |
Given the following notation - Ff. This represents: |
| | A) | a phenotype. |
| | B) | a genotype |
| | C) | a gamete. |
| | D) | a gonad |
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10 | |
A phenotype ratio of ___ is expected if a heterozygous genotype is crossed with a homozygous dominant genotype.
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| | A) | 1:0 |
| | B) | 1:1 |
| | C) | 1 : 2: 1 |
| | D) | 3:1 |
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11 | |
A heterozygous brown bull mates with a white cow. (Brown is the dominant trait). What are the expected phenotype ratios?
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| | A) | 100% brown |
| | B) | 100% white |
| | C) | 50% brown and 50 % white |
| | D) | 50% brown and 50% tan |
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12 | |
A rough coat of a guinea pig is dominant over a smooth coat. If 100% of the offspring are smooth coated, what are the genotypes and phenotypes of the parents? |
| | A) | RR - homozygous dominant rough and Rr - heterozygous rough |
| | B) | Rr - heterozygous rough and rr homozygous recessive smooth |
| | C) | Both parents are rr - homozygous recessive smooth |
| | D) | RR - homonzygous dominant rough and rr - homozygous recessive smooth. |
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13 | |
Two heterozygous tall pea plants are cross-pollinated. What are the phenotype ratios of the offspring?
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| | A) | 50% tall and 50% short (1:1) |
| | B) | 75% tall and 25% short (3:1) |
| | C) | 25% tall and 75% short (1:3) |
| | D) | 100% tall (1:0) |
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14 | |
In reference to the previous question, what are the expected genotypes of the offspring? |
| | A) | 25% TT, 50% Tt, 25% tt (1:2:1) |
| | B) | 75% Tt, 25% tt (3:1) |
| | C) | 50% TT, 25% Tt, 25%tt (2:1:1) |
| | D) | 50 % TT, 50 %Tt (1:1) |
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15 | |
Traits that involve more than 1 set of alleles are called: |
| | A) | co-dominant traits |
| | B) | incomplete dominance |
| | C) | heterozygous inheritance |
| | D) | multifactorial inheritance |
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16 | |
Which of the following is NOT a human multifactorial trait? |
| | A) | Widow's peak |
| | B) | Skin color |
| | C) | Height |
| | D) | Eye color |
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17 | |
The crossing of a red 4 o'clock flower and a white 4 o'clock flower results in pink flowers. This is an example of: |
| | A) | multifactorial inheritance |
| | B) | co-dominance |
| | C) | incomplete dominance |
| | D) | a sex-linked trait. |
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18 | |
______ occurs when alleles are equally expressed in the heterozygote. |
| | A) | Co-dominance |
| | B) | Sex-linking |
| | C) | Incomplete dominance |
| | D) | Continuous variation |
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19 | |
Human blood type is determined from having 2 of ____ alleles. |
| | A) | 2 |
| | B) | 3 |
| | C) | 4 |
| | D) | 5 |
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20 | |
ABO alleles determine the presence or absence of ________ on the red blood cells. |
| | A) | antigens |
| | B) | antibodies |
| | C) | fragments |
| | D) | ions |
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21 | |
The following blood types are possible if parents have genotypes AO and BO. |
| | A) | A |
| | B) | B |
| | C) | O |
| | D) | All of these are correct. |
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22 | |
A sex-linked trait is normally passed by the ____ to ____. |
| | A) | father to son |
| | B) | father to daughter |
| | C) | mother to son |
| | D) | mother to daughter |
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