To distinguish: The chromosomal abnormality in sex chromosome and autosome. Introduction: Humans cell contain 46 chromosome (2n) and are diploid in nature but at the time of fertilization only 23 (n) chromosome is receive by mother and 23 (n) chromosome is receive by father to form a zygote by the process of meiosis. Zygote is formed by the transfer of male gamete (sperm) and female gamete (ova). The ova and sperm are haploid and form a diploid zygote (2n). Zygote receives 46 chromosomes. Some humans are born with abnormalities as they receive abnormal chromosomal number in their cell. Abnormal chromosome is formed when chromosome fails to separate during meiosis and is known as nondisjunction. In normal individual, 46 chromosomes are present out of which 23 are from male and 23 from female. In which 22 pairs are autosome and 23 is sex chromosomes. So some disorders are also associated with the autosome and are called autosomal disorder.

Question

Want to see the full answer?

Answer 1

Question

Chapter 9.4, Problem 3CYP

Summary Introduction

To distinguish:

The chromosomal abnormality in sex chromosome and autosome.

Introduction:

Humans cell contain 46 chromosome (2n) and are diploid in nature but at the time of fertilization only 23 (n) chromosome is receive by mother and 23 (n) chromosome is receive by father to form a zygote by the process of meiosis. Zygote is formed by the transfer of male gamete (sperm) and female gamete (ova).

The ova and sperm are haploid and form a diploid zygote (2n). Zygote receives 46 chromosomes. Some humans are born with abnormalities as they receive abnormal chromosomal number in their cell.

Abnormal chromosome is formed when chromosome fails to separate during meiosis and is known as nondisjunction. In normal individual, 46 chromosomes are present out of which 23 are from male and 23 from female. In which 22 pairs are autosome and 23 is sex chromosomes. So some disorders are also associated with the autosome and are called autosomal disorder.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

None

Question #3: In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming there was just one gene conferring gametophytic obligate apomixis, and that the two parents are inbreds, what would be the consequences of such a cross if: a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the parental cross. b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non- apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female first (left side) in the…

Question #5: Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The genes show independent assortment. Recessive alleles at both loci are required for the facultative apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C. At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype. A facultative apomict male, capable of producing viable pollen, was crossed with a sexually reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following temperatures*: a) 15°C? b) 25°C? *for full credit, show crosses and genotypes where appropriate. Remember to position the female first (left side) in the cross. Type your answer here: