1. A diploid somatic cell from a pigeon (Columba livia) has a total of 80 chromo

Question

1. A diploid somatic cell from a pigeon (Columba livia) has a total of 80 chromosomes (2n = 80). Chickens have the ZZ-ZW chromosomal sex determination. What is the total number of chromosomes present in a single cell during prophase II of meiosis?

2. In the pigeon example above, what is the total number of chromosomes present in a single cell
during metaphase of mitosis?

3. ______ refers to when the phenotype of the heterozygote is intermediate to the two homozygotes.

4. In Drosophila, an individual who is XXY and has 2 sets of autosomal chromosomes will be____.

5. What phenomenon best describes a situation when the genotype of the mother determines the
phenotype of the offspring?

Explanation / Answer

Answer

1. Meiosis is reductional division, so during prophase II the chromosome no, is 40

2. Mitosis is equational division, so it is 80 only

3.Incomplete dominance

4.It is Genic Balance theory by Calvin Bridge, according to it, sex and ploidy level of drosophila is Female and diploid, using formula X/A ratio, ie. No of X chromosome Divided by Autosome

so 2/2=1

5. Maternal effect gene

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