Suppose that wing color for some butterfly is controlled by

Suppose that wing color for some butterfly is controlled by one gene with two alleles showing complete dominance (A and a). When one heterozygous individual produces gametes, it will make: a) gametes with \'AA\', Aa\', and \'aa\' b) gametes with mainly A because of dominance c) some gametes with \'A\' and some with \'a\' d) gametes containing \'Aa\' e) can\'t answer without information about linkage The proteins produced by your liver cells are different from the proteins produced by your brain cells. This is because your liver cells control transcription differently than brain cells do have different alleles than your brain cells because of crossing over have different chromosomes than brain cells because of independent assortment have different sequences of nitrogenous bases than brain cells all of the above DNA replication (synthesis) a) occurs during interphase before mitosis but not b) occurs during prophase of mitosis but not prophase I of meiosis is controlled by ribosomes in the nucleus is also called transcription e) none of the above When a human male undergoes normal meiosis, there are a) 40 autosomes in each gamete homologous pairs in each gamete b) 45 chromosomes in each gamete c) 23homologous pairs in each gamete 92 sister chromatids present in the primary in metaphase I 21 homologous pairs present in the primary spermatocyte in metaphase I

Solution

1. let AA= dominant gene

aa= recessive gene

fi generation produces Aa

f2 generation Aa xAa

Aa = 2

AA =1

aa= 1

phenotypic ratio=3:1

3. DNA replication always take place in S phase of the cell cycle where amount of DNA just doubles

4. When a human male undergos normal meiosis then there are 23 homologous pairs in each gamete

one from each parent (23x2=46).

AA	Aa
Aa	aa