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    how many double-helical dna molecules will be present in the sperm and egg cells of dogs that are diploid animals that contain 78 replicated chromosomes in each cell that enters meiosis?

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    How many double

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    How many double-helical DNA molecules will be present in the sperm and egg cells of dogs that are diploid animals that contain 78 replicated chromosomes in each cell that enters meiosis?

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    gametes

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    reproductive cells such as sperm and eggs

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    .Meiosis is a nuclear division resulting in cells that only have _ of each type of chromosomes and _ as many chromosomes as the parent cell. In animals it leads to the formation of eggs and sperm.

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    one; half

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    Terms in this set (116)

    gametes

    reproductive cells such as sperm and eggs

    .Meiosis is a nuclear division resulting in cells that only have _ of each type of chromosomes and _ as many chromosomes as the parent cell. In animals it leads to the formation of eggs and sperm.

    one; half

    In diploid _ organisms, individuals have _ versions of each type of chromosome.

    (2n); two

    The _ versions are called _. One homolog is inherited from the mother, one from the father. _ organisms just have one of each type of chromosome.

    two; homolog; haploid

    Each chromosome is replicated well before meiosis begins. This occurs as DNA is replicated during the _ phase of the cell cycle.

    S

    At the start of _, each chromosome contains a pair of sister chromatids, each with a double-helical _ molecule identical to that of the other sister chromatid.

    mitosis I; DNA

    Homologous pairs of chromosomes synapse early in meiosis I, forming a _- two closely paired homologous chromosomes. Non-sister chromatids undergo crossing over.

    bivalent

    The pair of homologous chromosomes, connected by at least one _, is moved to the _

    chiasma; metaphase plate

    At the end of meiosis I, the homologous chromosomes are seperated and distributed to two daugher cells. The daughter cells are _, because each receives one of each type of chromosome.

    haploid

    During _, sister chromatids of the replicated chromosomes seperate and are distributed to two daughter cells.

    meiosis II

    From one _ cell with replicated chromosomes, mieosis produces _ _ daughter cells with unreplicated chromosomes.

    diploid; four haploid

    Each cell produced by mieiosis receives a different combination of chromosomes. Genes are located on chromosomes, and often come in different forms ( _ ), each cell produced by meiosis receives a different complement of alleles for its genes. The resulting offspring are genetically distinct from one another and from their parents.

    alleles

    Gametes receive a random assortment of maternal and paternal chromosomes when _ separate in _. This is _

    homologs;meiosis I;independent assortment

    Because of _, each chromosomes contains a random assortment of paternal and maternal alleles

    crossing over

    _ results in a combination of chromosomes sets from different individuals

    Outcrossing

    If mistakes occur during meiosis, the resulting egg and sperm cells may contin the wrong number of chromosomes. Most often embryos with an incorrect number of chromosomes do no complete development. Children with _ syndrome, who have an extra copy of chromosome _, are an exception.

    Down; 21

    Most of the mistakes in meiotic are failures of either _ or _ to separate.

    homologous chromosomes; sister chromatids

    In _, all individuals are capable of bearing offspring. From this standpoint, it is more efficient than _, in which half the offspring (males) are unable to bear offspring.

    asexual; sexual

    Why would meiosis and sexual reproduction be favorable?

    A parent with a harmful allele can produce offspring without that allele, and generically diverse offspring are likely to include some that are better able to resist evolving pathogens and parasites

    chromosomes come in distinct sizes and shapes

    occur in pairs autosomes

    Chromosomes that are not directly involved in determining the sex of an individual.

    sex chromosomes

    Chromosomes that determine the sex of an individual

    homologous chromosomes or homologs (same proportion)

    Pair of chromosomes that are the same size, same appearance and same genes.

    homologous pair

    contain same genes in same positions along the two chromosomes,in same position, but NOT inherently identical.

    gene

    segment of DNA, found at a specific place on a chromosome, that influences a hereditary trait.

    each copy of the chromosome 2 in Drophilla carries many different genes, one influencing eye color. this gene comes in different forms- red and purple.

    alleles differentiate this. One homolog may have the red allele while the other has the purple allele.

    karyotype

    the number and visual appearance of the chromosomes in the cell nuclei of an organism or species.

    diploid

    organisms that have two versions (homologs) of each type of chromosome. They have two alleles of each gene (Aa/ AA/ aa)

    halpoid

    organisms like bacteria, archaea and algae and fungi.

    have one copy of each chromosome, one allele of each gene

    n / halpoid number

    distinct types of chromosomes in a given cell. sex chromosomes are unpaired but count as ONE distinct type. humans have 23.

    ploidy

    number of chromosome sets. diploid has 2, read 2n. haploids have 1, so read as just n.

    cells replicate each of their chromosomes before starting meiosis,

    Source : quizlet.com

    How many double

    Answer:39 double-helical DNA molecules will be presenet in sperm and 39 in egg.Explanation:Each chromosome is made up of histone protein and a molecu

    sweet-ann [11.9K] 1 year ago 15

    How many double-helical DNA molecules will be present in the sperm and egg cells of dogs that are diploid animals that contain 7

    8 replicated chromosomes in each cell that enters meiosis?

    Biology 1 answer:

    AleksAgata [21]1 year ago

    3 0

    Answer:

    39 double-helical DNA molecules will be presenet in sperm and 39 in egg.

    Explanation:

    Each chromosome is made up of histone protein and a molecule of DNA.

    Each cell contain double number of chromosomes (2n) except a few exceptions like sperm (1n) and egg (1n).

    Human body cells contain 46 chromosomes while sex cells contain 23 chromosomes because of meiosis. Similarly dog cells contain 78 chromosomes while their gametes i.e egg and sperm each contain 39 chromosomes. The fertilization of sperm and egg will restore the chromosome numbers.

    As there is only one double helix DNA present in chromosome, so there would by 39 double helix DNA in sperm and 39 double helix DNA in egg.

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