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3 years ago

What is an example of a chromosomal nondisjunction that occurs during the first division?

1 answer:

4 0

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. There are three forms of nondisjunction: failure of a pair of homologous chromosomes to separate in meiosis I, failure of sister chromatids to separate during meiosis II, and failure of sister chromatids to separate during mitosis.[1][2][3] Nondisjunction results in daughter cells with abnormal chromosome numbers (aneuploidy).

Calvin Bridges and Thomas Hunt Morgan are credited with discovering nondisjunction in Drosophila melanogaster sex chromosomes in the spring of 1910, while working in the Zoological Laboratory of Columbia University.[4]

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Some algae demonstrate the phenomenon of alternation of generations, in which a multicellular, diploid, spore-producing organism

Leto [7]

Answer:

Option c. Only the haploid organism may also reproduce asexually.

Explanation:

It is scientifically approved that algae and fungi are able to form true asexual spores. This process of spore formation involves mitosis and resultant spore is called mito-spore which develop into new offspring.

Reference: Smith, B. A., and DANIEL D. Burke. "Evidence for the presence of messenger ribonucleic acid in Allomyces macrogynus mitospores." Journal of bacteriology 138.2 (1979): 535-541.

3 0

4 years ago

Which characteristics must an object possess in order to be considered alive?

Viktor [21]

Characteristics of Living Creatures

1. Move
2. Eat
3. Sensitive to Stimuli
4. Breathe
5. Grow
6. Dispose of Waste
7. Reproduction
8. Adapt

7 0

3 years ago

Dr. taylor bled into her left cerebral hemisphere. what is the function of the cerebrum? dr. taylor bled into her left cerebral

Marat540 [252]

Answer:

processes visual and auditory data, generates reflexive somatic motor responses, and maintains consciousness

Explanation:

The cerebrum is the largest part of the brain that contains left and right hemispheres.

The functions of the cerebrum are:

interpreting touch
vision and hearing
speech
reasoning
emotions
learning
fine control of movement.

The whole brain system has got three parts, which are:

cerebrum,
cerebellum
Brain stem.

3 0

3 years ago

Which statements describe the inheritance of traits? Select three options.

liraira [26]

Answer:

The correct options are:

All traits are inherited.

Offspring inherit one allele for a gene from each parent.

An offspring with two identical alleles for a trait is homozygous.

Explanation:

In the biological world, a trait can be described as a genetic characteristic which makes up an organism. Every organism has a particular set of traits.

Traits are inherited from parents, however they can be influenced by the environment.

The alleles of a gene make up the genotype and the influencing phenotype. An organism acquires one allele for the gene pair from each parent.

When both the alleles of a gene pair are similar, the organism is said to be homozygous for the trait. If both the alleles of a gene pair are different, the organism is said to be heterozygous for the trait.

3 0

3 years ago

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DNA and RNA are both organic molecules called

Leno4ka [110]

Answer:

Explanation:

Nucleic acids are the organic materials present in all organisms in the form of DNA or RNA. These nucleic acids are formed by the combination of nitrogenous bases, sugar molecules and the phosphate groups that are linked by different bonds in a series of sequences. The DNA structure defines the basic genetic makeup of our body.

3 0

2 years ago

Read 2 more answers