Non Mendelian Inheritance Flashcards
When a curly-haired person reproduces with a straight-haired person and their children have wavy hair, this is an example of _
Incomplete dominance
A man with blood type A reproduces with a woman who has blood type B. Their child has blood type O. Give the genotypes of all persons involved:
Man = _
Woman = __
Child = __
IAi
IBi
ii
If a child has type AB blood and the father has type B blood, what could the genotype of the mother be?
IAIA or IAi or IAIB
If a child has type B blood and the father has type O, what could the genotype of the mother be?
IBIB or IBi or IAIB
When observing a trait, such as human hair color, you notice that there is a very wide spectrum of phenotypes rather than just a specific set. This means that the trait of hair color is most likely __.
Polygenic
In rabbits, there are four alleles for coat color, but each rabbit has only two of these. What type of inheritance pattern is this?
Multiple alleles
Match the descriptions with these terms:
X and Y chromosomes XX homologous chromosomes autosomes XY
__ sex chromosomes
__ all chromosomes except the sex chromosomes
__ pairs of chromosomes
__ female
__ male
X and Y chromosomes
autosomes
homologous chromosomes
XX
XY
Bar eye in Drosophila is an X-linked characteristic in which bar eye (B) is dominant over normal eye (b). The genotype of a normal-eyed female is __, and the genotype of a bar-eyed male is __.
XbXb
XBY
If XB = normal vision and Xb = color blindness, state the sex and the phenotype of each of these genotypes
XBXB = ___
XBXb = __
XbXb = ___
XBY = ____
XbY = ___
normal vision female
normal vision (carrier) female
color blind female
normal vision male
color blind male
Why do more males than females have X-linked recessive genetic disorders?
They only need to receive one recessive allele to express the recessive phenotype. Females need two recessive alleles to express the recessive phenotype. So it is easier for males to inherit and express a recessive X-linked trait than females.
Why do sons inherit the disorder from their mothers and never from their fathers?
Sons only receive a Y chromosome from their fathers, so a son’s X chromosome and its allele is completely determined by the mother. The X chromosome in the son’s XY pair is from the mother only.
Polygenic inheritance can explain
A range of phenotypes among the offspring.
The occurrence of degrees of dominance.
The spectrum of skin color in humans.
Both a and c are correct.
Both a and c
Children with which of the following blood types could not have parents who both have type A blood?
Type A
Type O
Type AB
Type B
Both c and d are correct
Both
Inheritance by multiple alleles is illustrated by the inheritance of
Skin color
Blood type
Presence of freckles
Both b and c are correct
Blood
Which of the following statements is NOT true?
Genes are on chromosomes and behave similarly.
The chromosomes, but not the alleles, occur in pairs in diploid cells.
Both the chromosomes and the alleles of each pair separate independently during meiosis.
Fertilization restores the diploid chromosome number and the paired condition for alleles in the zygote.
The chromosoems
