In a simple monohybrid cross the individuals of 100% known genotype in the F2 of
ID: 96813 • Letter: I
Question
In a simple monohybrid cross the individuals of 100% known genotype in the F2 offspring, are which of these? a) the heterozygous individuals b) the homozygous dominant individuals c) the homozygous recessive individuals d) you could not determine the geneotype of any offspring without performing additional tests. If an individual contains two alleles for a particular gene and the two alleles are different from each other, the individual is said to be: a) homozygous dominant b) homozygous recessive c) heterozygous d) none of these. If an individual contains two alleles for a particular character and the two alleles are different, which of the following is true? a) all the gametes produced by the individual will carry a dominant factor for the trait. b) all the gametes produced will carry the recessive allele for the gene. c) 3/4 of the gametes will contain the dominant allele and 1/4 of the alleles will contain the recessive allele. d) 1/2 of the gametes will contain the dominant allele ane 1/2 of the gametes will contain the recessive allele. 1) How many different genotypes are possible when there is a cross of two individuals that are each heterozygous for two genes (a dihybrid cross)? i.e. AaBb crossed with AaBb a) three b) nine c) seven d) sixteen e) twenty-sevenExplanation / Answer
17) c homozygous recessive
The F1 cross would be Aa x Aa. The gametes A and a combine to give AA Aa aA and aa. The first three all have the same dominant phenotype, the last one has the recessive phenotype, therefore recessive genotype, so the answer is c.
18) c Heterozygous
19 d 1/2 of the gametes will contain the dominant allele and 1/2 of the gametes will contains the recessive allele
20e sixteen 4x4=16 genotypes