Chapter 14 part 2 Flashcards
What is a testcross
Breeding an organism with unknown genotype with a recessive homozygote because it can reveal the genotype of that organism.
State the LAW OF INDEPENDENT ASSORTMENT
Two or more genes assort independently-that is, each pair of alleles segregates independently of any other pair of alleles-during gamete formation.
Achondroplasia is caused by dominant or recessive alleles?
Dominant allele
What is the disease that cause dwarfism
Achondroplasia
Why human is not a good subject for genetic research
- Long generation time
- Produce few offsprings
- Breeding experiments are unacceptable
Recessive disorders are caused by what type of allele
Recessive homozygous
What is the characteristic of albinism
No pigment in skin and sometimes eye color
Cystic fibrosis characterisiticq
Absent of chloride channels in plasma membranes that cause mucus in internal organ and abnormal absorption of nutrients in small intestine.
Sicke-cell characteristic
Lack of single amino acids in hemoglobin
What is polygenic inheritance
An additive effect of two or more genes on a single phenotype
Example of polygenic inheritance
Hair, eye color, height, skin color, intelligence, metabolism
Example of recessive disorder
Albinism
Cystic fibrosis
Sickle cell
What is complete dominance
Phenotypes of heterozygotes are the same with dominant homozygotes
What is incomplete dominance
Phenotype of F1 is in between phenotypes of the parents
What is multifactorial
Phenotype that depends on both genotype and environmental influences.
