Download Chapter 11 tst rev answer

Chapter 11-Complex Inheritance & Human Heredity Review (sections 1 &2)
True/False: circle your answer choice.
1. Genetic disorders can be caused by dominant or recessive alleles. TRUE
2. Individuals with albinism do not have melanin in their skin, hair, and eyes. TRUE
3.
Some traits are inherited through complex inheritance patterns, such as intermediate
dominance, cooperative dominance and single alleles. FALSE
4.
Both genes and environment can influence an organism’s genotype. FALSE
5. What term describes a person who is heterozygous for a recessive disorder?
This person would be considered a carrier as he/she will not express recessive phenotype but
can pass on the recessive gene to the next generation
6.
Make a statement that is TRUE about carriers of a recessive disorder.
Have dominant phenotype, have one recessive allele, may pass on
disorder
7.
How is the inheritance pattern between parents and offspring represented diagrammatically?
pedigree
8.
What does the figure below represent? A pedigree of a recessive disorder
9. Human blood groups are determined by ______. What inheritance pattern? Multiple alleles
10.Traits such as skin color and height which result from multiple genes are called ___. Polygenic
traits
11. In the pedigree below which family members are carriers of Tay-Sachs? Be specific in
generation and gender/relationship.
father (1) and mother (2) of generation I
and the daughter (3) has disorder
12. How is it possible for one of the children in the above figure to express Tay-Sachs?
Each carrier parent contributed a recessive gene to child’s
genotype
13. What determines gender in humans?
Sex chromosomes pair #23 (X and/or Y)
14. Which two terms best describe the inheritance of human blood types? (Recessive is not one of
Multiple alleles determine phenotype and one phenotype AB express
codominant trait
them).
15.What would be the blood type
& (GENOTYPE) of a person who inherited an A allele from one
parent and an O allele from the other? Type A with genotype of IAi (AO),
heterozygous for type A
Problems/Short Answer/Explain: Use complete sentences and specific nouns (refrain from “it”,
“they”, “Because”…). Use a Punnett square to help determine results of crosses.
16. An individual has both normal and sickle shaped RBC’s, they have a heterozygous genotype.
What type of inheritance pattern does this show?
Codominance
17. Determine the genotypes of the parents if the father is blood type A, the mother is blood type
B, the daughter is blood type O, one son is blood type AB, and the other son is blood type B.
Father ___IAi_____
Mother ___IBi______
18. Given the parents in #17 could they have a daughter with the blood type A? ________
Why?
type A
Yes, father offers IA allele and mother offers i for heterozygous
19.Can two parents with albinism have an unaffected child? Explain. No, it is a recessive trait
so the parents offer only the recessive alleles to offspring
20. In a breed of cattle, roan is the codominant condition for R-red or W-white coat color, what will
be the genotypic and phenotypic ratios for offspring from a cross of a red male (bull) and a roan
female (cow)?
21. Parents with genotype IAi and IBIB can produce a child with type O blood. True or False. Why?
(be specific in reasoning)
22. In four o’clocks, the genes for red flowers, R, and white flowers, R’, show incomplete
dominance. The heterozygous conditions results in pink. A white four o’clock is crossed with a
pink one. Show the cross. What is the expected genotypic ratio? What is the expected
phenotypic ratio?