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How does demographic and religious context relate to interracial relationships among same-sex and different-sex couples? Using couple data from the 2012 to 2014 American Community Surveys matched to aggregate data from the 2010 Census and 2010 Religious Congregations and Membership Study, we test how heterogamy patterns for same-sex and different-sex couples vary by the demographic and religious makeup of cities, using multinomial logistic regressions to compare interracial and same-race couples. We find that same-sex couples are more likely to be in a White/Black interracial pairing than different-sex couples. White partners are more likely to be in an interracial relationship if they are in a city with a large minority group population. In addition, context is differently associated with interracial unions for same-sex and different-sex couples, varying for each racial combination.

This study examines whether family patterns (social origin of family, marital SES, arranged marriage, higher family size norm, and patriarchal family structure (e.g., extended/joint family, patrilocal residence, and family authority) affect age-heterogamy in marriage in rural Bangladesh. One thousand seven hundred fifty-five pairs of married couples for research purpose were randomly selected from Tanore Upazila of Rajshahi district, Bangladesh. The selected couples (e.g., both husband and wife) were individually interviewed, using questionnaire method (e.g., open-ended and close-ended questions). The collected data were analyzed, applying Spearman’s rank order bivariate correlation, X 2 test, and binary logistic regression. Descriptive findings indicated that most of the couples (76.58 %) studied were age-heterogamous than age-homogenous (23.42 %) in the study area. Results suggested that age-heterogamous marriages than age-homogamous marriages were significantly associated with ethnicity, marital SES, family income, arranged marriage norms, patrilocal residence, and autocratic family authority, adjusting for sex, age, age at marriage, and marital duration. Of the predicting factors, Muslim ethnicity, lower marital SES, middle family income, arranged marriage, middle family size, patrilocal residence, and autocratic family authority were the greatest (1–3 % times) risks factors to persist age-heterogamous marriages among the married couples in rural Bangladesh. This research found that age-heterogamous marriages than age-homogamous marriages were significantly associated with Muslim collective identity than Santal identity, hyper marital SES, arranged marriage, middle family size, and patriarchal family structure (patrilocal residence and men’s absolute authority than other characteristics in the family in rural Bangladesh, adjusting for current age, age at first marriage, and marital duration. The findings may have implications in social policy practice with age-heterogamous married couples in rural Bangladesh.

This study investigates the effect of native/immigrant intermarriage on divorce. We used a rich longitudinal dataset from the German Socio-Economic Panel and applied event-history techniques to examine the risk of divorce among immigrants in Germany. Our analysis of the divorce rates of 5,648 marriages shows that immigrant couples have a lower risk of divorce than do natives. However, marriages between German-born individuals and immigrants have a higher likelihood of separation than marriages between two German-born individuals or between immigrants from the same country, supporting the exogamy hypothesis. This pattern largely persists when controlling for the socio-demographic and human-capital characteristics of the spouses. The divorce risk increases with the cultural distance between the partners and when the spouses demonstrate differences in their social backgrounds, also supporting the heterogamy hypothesis and the selectivity hypothesis. We found no support for the adaptation and convergence hypotheses. Divorce levels for mixed marriages are neither similar to the levels of one of the constituent origin groups, nor do they fall between the levels of the two groups; the divorce levels for native/immigrant marriages are higher than those for endogamous marriages.

In mammals, birds, snakes and many lizards and fish, sex is determined genetically (either male XY heterogamy or female ZW heterogamy), whereas in alligators, and in many reptiles and turtles, the temperature at which eggs are incubated determines sex. Evidently, different sex-determining systems (and sex chromosome pairs) have evolved independently in different vertebrate lineages. Homology shared by Xs and Ys (and Zs and Ws) within species demonstrates that differentiated sex chromosomes were once homologous, and that the sex-specific non-recombining Y (or W) was progressively degraded. Consequently, genes are left in single copy in the heterogametic sex, which results in an imbalance of the dosage of genes on the sex chromosomes between the sexes, and also relative to the autosomes. Dosage compensation has evolved in diverse species to compensate for these dose differences, with the stringency of compensation apparently differing greatly between lineages, perhaps reflecting the concentration of genes on the original autosome pair that required dosage compensation. We discuss the organization and evolution of amniote sex chromosomes, and hypothesize that dosage insensitivity might predispose an autosome to evolving function as a sex chromosome.

Hypotheses are developed about the effects of husbands' and wives' religious affiliations upon fertility. The hypotheses are based upon the following ideas. First, different religions have different norms about fertility and the tradeoffs between the quality and quantity of children. Differences in religious beliefs between spouses may therefore lead to disagreement and conflict over fertility decisions and any possible resolution through bargaining. Second, a low level of religious compatibility between spouses may increase the probability of marital dissolution, decreasing the optimal amount of investments in spouse-specific human capital. Analyses of data from the 1987-88 National Survey of Families and Households conducted in the US suggest that both of these effects are important factors in explaining the observed linkages between the religious composition of marital unions and their fertility behavior.

In later years, sex selection has become of importance for prevention of X-linked diseases in families at risk. There is today a potential to perform sperm selection before fertilization by taking advantage of the chromosomal heterogamy of spermatozoa, and before implantation by preimplantation genetic diagnosis (PGD). The methods of sex determination by separating spermatozoa are, in our opinion, still not safe enough for routine clinical use. Apart from the technical problems and possible associated risks, which first must be better evaluated, the most critical questions are ethical or legal. We support the use of sex selection by PGD in X-linked severe disease, but due to the potential risks of misuse, we are not prepared to support a more liberal attitude as long as the discriminated sex in nearly all parts of the world are women.

A study was made of the occurrence of apomixis and heterogamy in rose rootstocks belonging to the Caninae. Of several ‘Edelcanina’-selections progenies obtained from crossings with wild roses or from self- and open pollinations were analysed morphologically and cytologically. It was concluded that both apomixis and normal generative propagation occur. The presence of aneuploid plants is discussed, especially with reference to earlier investigations.

STERN1, analysing the evidence concerning the mode of inheritance of 16 traits which were suspected to be completely Y-linked in man, emphasized that in organisms with heterogamy of the male sex, complete Y -linkage of genes with full penetrance is characterized by: (a) occurrence of the trait in males only; (b) its re-occurrence in all sons of affected males; (c) the daughters of affected men being not only phenotypically normal but also, in addition, not having affected offspring. One of the traits discussed was hypertrichosis of the ears (hypertrichosis pinnae auris2), and Stern criticized the original pedigree published by Tommasi3,4 on grounds of its having been based on unreliable hearsay evidence. He concluded that judgment on the mode of inheritance of this trait should be postponed until better evidence became available.