JUPEB 2022 Biology QUESTIONS AND ANSWERS – June/July Runz
*JUPEB–BIOLOGY–THEORY*
(1a)
(i) *GENES:*
It is a basic unit of heredity and a sequence of nucleotides in DNA that encodes the synthesis of a gene product, either RNA or protein.
(ii) *ALLELES:*
Allele is variant of a given gene. In genetics, genes normally exhibitdeviations or diversity: all alleles for a particular trait together make up the set of genetic information that defines a gene.
(iii) *HOMOZYGOUS ORGANISMS:*
Homozygous, as related to genetics, refers to having inherited the same versions (alleles) of a genomic marker from each biological parent.
(iv) *HETEROZYGOUS ORGANISMS:*
Heterozygous, as related to genetics, refers to having inherited different versions (alleles) of a genomic marker from each biological parent. Thus, an individual who is heterozygous for a genomic marker has two different versions of that marker.
(v) *DOMINANT ALLELE:*
A dominant allele is a variation of a gene that will produce a certain phenotype, even in the presence of other alleles.
(vi) *RECESSIVE ALLELE:*
A recessive allele is a variety of genetic code that does not create a phenotype if a dominant allele is present.
(vii) *TEST CROSS:*
A test cross is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype (and phenotype).
(viii) *SEX LINKED GENES:*
Sex-linked, as related to genetics, refers to characteristics (or traits) that are influenced by genes carried on the sex chromosomes.
(ix) *RHESUS:*
The Rhesus factor, or Rh factor, is a certain type of protein found on the outside of blood cells.
(x) *ALBINISM:*
A group of genetic conditions marked by little or none of the pigment melanin in the skin, hair, and/or eyes.
(1c)
Genetic variation is the difference in DNA among individuals or the differences between populations.
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(6a)
Fertilization is defined as the union of two gametes. During fertilization, sperm and egg fuse to form a diploid zygote to initiate prenatal development.
(6b)
SEEDS
– After the fertilization, the ovule converts into the seed.
– The outer layer of the seed is known as the testa.
– Seed basically are used for reproduction, and it is the product of sexual reproduction of the plant.
– Seeds do not undergo a ripening process.
– Seeds contain a low amount of moisture compared to seeds, and its shelf life is comparatively high.
FRUITS
– After the fertilization, the ovary converts into the fruit.
– The outer layer of the fruit is known as the exocarp.
– Fruit does not represent reproduction units.
– Fruits undergo a ripening process and the plant hormone ethylene reasons ripening of numerous types of fruit.
– Fruits contain a high amount of moisture compared to seeds, and its shelf life is comparatively low.
(6c)
The flower is designed to start the process of reproduction. The female parts creates an unfertilized egg (ovule). The egg stay in the ovary and wait to be fertilized. The male parts (to be specific, the anther) produces pollen, that has the sperm needed to fertilize the egg.
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