In humans, the ability to roll one's tongue is a dominant trait (R). A woman who can roll her tongue ismarried to a man who cannot roll his tongue. The couple's daughter, Brie, can roll her tongue, buttheir son, Michael, cannot.Imagine, for a moment, that the mother and father separate, and the mother decides toIf her second husband is homozygous dominant for the tongue-rolling gene, whatremarry.would be the genotypic ratio of their offspring (i.e., the F1 generation)?a. 1 RR: 2 Rr : 1 rrb. 2 RR: 2 rrc. 2 RR: 2 Rrd. 2 RR :1 Rr :1 rre. None of the aboveQUESTION 71Characteristics (or traits) of an organism, such as those described in the examples above, are said tobe heritable. In this context, the term "heritable" means...a. Able to induce production of hair in various speciesb. Traits that are most frequently seen within a given population early in developmentc. The ability for traits to be passed down from parent to offspringd. Traits that are only present when both parents are homozygous dominante. None of the above

Heterozygous refers to having inherited different forms of a particular gene from each parent. A homozygous genotype is a genotype where an individual inherits identical forms of a particular gene from each parent.70. answer. 2RR:2Rr Rr x RR woman x man the woman is heterozygous as her first marriage yielded as on who cannot roll his tongue that means Michael`smother and father both are heterozygous. R r R RR Rr R RR Rr