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提问人：网友razerkraiter
发布时间：2022-01-07
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The cellular reason for X-inactivation is to reduce the amount of nondisjunction during meiosis.
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Company history, location and key personnel can’t be omitted in the company presentation.
第4题
In species in which females are the homogametic sex, gender of offspring is determined by the male.
第5题
The R locus determines flower color in a new plant species. Plants that are genotype RR have red flowers, and plants that are rr have white flowers. However, Rr plants have pink flowers. What type of inheritance does this demonstrate for flower color in these plants?
A、complete dominance
B、incomplete dominance
C、codominance
D、complementation
E、lethal alleles
第6题
Species in which individuals have only male or only female reproductive structures are called dioecious.
第7题
In humans, blood types A and B are codominant to each other and each is dominant to O. What blood types are possible among the offspring of a couple of blood types AB and A?
A、A, B, AB, and O
B、A, B, and AB only
C、A and B only
D、A, B, and O only
E、A and AB only
第8题
Interactions among the human ABO blood group alleles involve _____ and _____.
A、codominance; complete dominance
B、codominance; incomplete dominance
C、complete dominance; incomplete dominance
D、epistasis; complementation
E、continuous variation; environmental variation
第9题
Achondroplasia is a common cause of dwarfism in humans. All individuals with achondroplasia are thought to be heterozygous at the locus that controls this trait. When two individuals with achondroplasia mate, the offspring occur in a ratio of 2 achondroplasia : 1 normal. What is the MOST likely explanation for these observations?
A、Achondroplasia is incompletely dominant to the normal condition.
B、Achondroplasia is codominant to the normal condition.
C、The allele that causes achondroplasia is a dominant lethal allele.
D、The allele that causes achondroplasia is a recessive lethal allele.
E、The allele that causes achondroplasia is a late-onset lethal allele.
第10题
Hair color is determined in Labrador retrievers by alleles at the B and E loci. A dominant allele B encodes black pigment, whereas a recessive allele b encodes brown pigment. Alleles at a second locus affect the deposition of the pigment in the shaft of the hair; dominant allele E allows dark pigment (black or brown) to be deposited, whereas recessive allele e prevents the deposition of dark pigment, causing the hair to be yellow. A black female Labrador retriever was mated with a yellow male. Half of the puppies were black and half were yellow. If the genotype of the black female parent was Bb Ee, then what was the genotype of the other parent?
A、bb ee
B、bb EE
C、Bb ee
D、BB ee
E、BB EE
