1. Unit 4 - Genetics – heredity Review1
Unit 4 - Genetics – heredity Review

2. 1
Traits such as an individual’s skin, hair, and eye color result from A. One gene acting alone B. One allele from each parent acting together C. Several genes acting together D. One dominant allele

3. 2
The different forms of a gene that decides a characteristic are known as A. Alleles B. Phenotypes C. Genes D. Albinism

4. Ff
Ff, ff
FF,Ff,ff ff 3
The allele for freckles, F, is dominant among humans. If a woman with freckles (FF) and a man without freckles (ff) have children, what are the possible genotypes of the children?

5. 4
A. A phenotype is the entire genetic makeup of an organism, whereas a genotype is the combination of genes for one specific trait.
B. A phenotype is the appearance of an organism, whereas a genotype is the genetic makeup of an organism
Which one of the following best describes the difference between the meaning of phenotype and genotype?

6. 5
What is heredity?
  A. Traits passing from offspring to parents B. Traits passing from parents to offspring C. Plants that are cross-pollinated D. The ratio of dominant to recessive

7. 6
6. The different forms of a gene that decides a characteristic are known as
Alleles
Phenotypes
Albinism
Genes

8. What are the structures where genes are located?7
What are the structures where genes are located?
Cytosine
Molecules
Chromosomes
nucleotides

9. 8
What is a plant that has two dominant genes or two recessives genes called?
Organism
Genotype
Homozygous
Heterozygous

10. 9. Look at the diagram. If purple (P) is dominant, and white (p) is recessive, what color will one out of every four of the offspring be?
Purple b. white 9
P P P p PP Pp pp

11. What did Mendel discover about recessive traits?10
What did Mendel discover about recessive traits?
Recessive traits reappear in the 2nd generation
Recessive traits never disappear
Recessive traits never appear in the 2nd generation
Recessive traits become dominant

12. 11
R r
In some plants, the allele for round seeds (R) is dominant over wrinkled seeds (r). Which of these genotypes will accurately complete the Punnett square above?
A. RR C. rR
B. Rr D. rr   R r RR Rr ??

13. 12
P p
 Look at the table. What is the probability that the offspring will be heterozygous?
25% c. 50%
75% d. 100% P p PP Pp pp